### New features

* [#117](https://github.com/rubocop/rubocop/issues/117): Add `--parallel` option for running RuboCop in multiple processes or threads. ([@jonas054][])
* Add auto-correct support to `Style/MixinGrouping`. ([@rrosenblum][])
* [#4236](https://github.com/rubocop/rubocop/issues/4236): Add new `Rails/ApplicationJob` and `Rails/ApplicationRecord` cops. ([@tjwp][])
* [#4078](https://github.com/rubocop/rubocop/pull/4078): Add new `Performance/Caller` cop. ([@alpaca-tc][])
* [#4314](https://github.com/rubocop/rubocop/pull/4314): Check slow hash accessing in `Array#sort` by `Performance/CompareWithBlock`. ([@pocke][])
* [#3438](https://github.com/rubocop/rubocop/issues/3438): Add new `Style/FormatStringToken` cop. ([@backus][])
* [#4342](https://github.com/rubocop/rubocop/pull/4342): Add new `Lint/ScriptPermission` cop. ([@yhirano55][])
* [#4145](https://github.com/rubocop/rubocop/issues/4145): Add new `Style/YodaCondition` cop. ([@smakagon][])
* [#4403](https://github.com/rubocop/rubocop/pull/4403): Add public API `Cop.autocorrect_incompatible_with` for specifying other cops that should not autocorrect together. ([@backus][])
* [#4354](https://github.com/rubocop/rubocop/pull/4354): Add autocorrect to `Style/FormatString`. ([@hoshinotsuyoshi][])
* [#4021](https://github.com/rubocop/rubocop/pull/4021): Add new `Style/MultipleComparison` cop. ([@dabroz][])
* New `Lint/RescueType` cop. ([@rrosenblum][])

### Changes

* [#4262](https://github.com/rubocop/rubocop/pull/4262): Add new `MinSize` configuration to `Style/SymbolArray`, consistent with the same configuration in `Style/WordArray`. ([@scottmatthewman][])
* [#3400](https://github.com/rubocop/rubocop/issues/3400): Remove auto-correct support from Lint/Debugger. ([@ilansh][])
* [#4278](https://github.com/rubocop/rubocop/pull/4278): Move all cops dealing with whitespace into a new department called `Layout`. ([@jonas054][])
* [#4320](https://github.com/rubocop/rubocop/pull/4320): Update `Rails/OutputSafety` to disallow wrapping `raw` or `html_safe` with `safe_join`. ([@klesse413][])
* [#4336](https://github.com/rubocop/rubocop/issues/4336): Store `rubocop_cache` in safer directories. ([@jonas054][])
* [#4361](https://github.com/rubocop/rubocop/pull/4361): Use relative path for offense message in `Lint/DuplicateMethods`. ([@pocke][])
* [#4385](https://github.com/rubocop/rubocop/pull/4385): Include `.jb` file by default. ([@pocke][])

### Bug fixes

* [#4265](https://github.com/rubocop/rubocop/pull/4265): Require a space before first argument of a method call in `Style/SpaceBeforeFirstArg` cop. ([@cjlarose][])
* [#4237](https://github.com/rubocop/rubocop/pull/4237): Fix false positive in `Lint/AmbiguousBlockAssociation` cop for lambdas. ([@smakagon][])
* [#4242](https://github.com/rubocop/rubocop/issues/4242): Add `Capfile` to the list of known Ruby filenames. ([@bbatsov][])
* [#4240](https://github.com/rubocop/rubocop/issues/4240): Handle `||=` in `Rails/RelativeDateConstant`. ([@bbatsov][])
* [#4241](https://github.com/rubocop/rubocop/issues/4241): Prevent `Rails/Blank` and `Rails/Present` from breaking when there is no explicit receiver. ([@rrosenblum][])
* [#4249](https://github.com/rubocop/rubocop/issues/4249): Handle multiple assignment in `Rails/RelativeDateConstant`. ([@bbatsov][])
* [#4250](https://github.com/rubocop/rubocop/issues/4250): Improve a bit the Ruby code detection config. ([@bbatsov][])
* [#4283](https://github.com/rubocop/rubocop/issues/4283): Fix `Style/EmptyCaseCondition` autocorrect bug - when first `when` branch includes comma-delimited alternatives. ([@ilansh][])
* [#4268](https://github.com/rubocop/rubocop/issues/4268): Handle end-of-line comments when autocorrecting Style/EmptyLinesAroundAccessModifier. ([@vergenzt][])
* [#4275](https://github.com/rubocop/rubocop/issues/4275): Prevent `Style/MethodCallWithArgsParentheses` from blowing up on `yield`. ([@drenmi][])
* [#3969](https://github.com/rubocop/rubocop/issues/3969): Handle multiline method call alignment for arguments to methods. ([@jonas054][])
* [#4304](https://github.com/rubocop/rubocop/pull/4304): Allow enabling whole departments when `DisabledByDefault` is `true`. ([@jonas054][])
* [#4264](https://github.com/rubocop/rubocop/issues/4264): Prevent `Rails/SaveBang` from blowing up when using the assigned variable in a hash. ([@drenmi][])
* [#4310](https://github.com/rubocop/rubocop/pull/4310): Treat paths containing invalid byte sequences as non-matches. ([@mclark][])
* [#4063](https://github.com/rubocop/rubocop/issues/4063): Fix Rails/ReversibleMigration misdetection. ([@gprado][])
* [#4339](https://github.com/rubocop/rubocop/pull/4339): Fix false positive in `Security/Eval` cop for multiline string lietral. ([@pocke][])
* [#4339](https://github.com/rubocop/rubocop/pull/4339): Fix false negative in `Security/Eval` cop for `Binding#eval`. ([@pocke][])
* [#4327](https://github.com/rubocop/rubocop/issues/4327): Prevent `Layout/SpaceInsidePercentLiteralDelimiters` from registering offenses on execute-strings. ([@drenmi][])
* [#4371](https://github.com/rubocop/rubocop/issues/4371): Prevent `Style/MethodName` from complaining about unary operator definitions. ([@drenmi][])
* [#4366](https://github.com/rubocop/rubocop/issues/4366): Prevent `Performance/RedundantMerge` from blowing up on double splat arguments. ([@drenmi][])
* [#4352](https://github.com/rubocop/rubocop/issues/4352): Fix the auto-correct of `Style/AndOr` when Enumerable accessors (`[]`) are used. ([@rrosenblum][])
* [#4393](https://github.com/rubocop/rubocop/issues/4393): Prevent `Style/InverseMethods` from registering an offense for methods that are double negated. ([@rrosenblum][])
* [#4394](https://github.com/rubocop/rubocop/issues/4394): Prevent some cops from breaking on safe navigation operator. ([@drenmi][])
* [#4260](https://github.com/rubocop/rubocop/issues/4260): Prevent `Rails/SkipsModelValidations` from registering an offense for `FileUtils.touch`. ([@rrosenblum][])

[@bbatsov]: https://github.com/bbatsov
[@jonas054]: https://github.com/jonas054
[@yujinakayama]: https://github.com/yujinakayama
[@dblock]: https://github.com/dblock
[@nevir]: https://github.com/nevir
[@daviddavis]: https://github.com/daviddavis
[@sds]: https://github.com/sds
[@fancyremarker]: https://github.com/fancyremarker
[@sinisterchipmunk]: https://github.com/sinisterchipmunk
[@vonTronje]: https://github.com/vonTronje
[@agrimm]: https://github.com/agrimm
[@pmenglund]: https://github.com/pmenglund
[@chulkilee]: https://github.com/chulkilee
[@codez]: https://github.com/codez
[@cyberdelia]: https://github.com/cyberdelia
[@emou]: https://github.com/emou
[@skanev]: http://github.com/skanev
[@claco]: http://github.com/claco
[@rifraf]: http://github.com/rifraf
[@scottmatthewman]: https://github.com/scottmatthewman
[@ma2gedev]: http://github.com/ma2gedev
[@jeremyolliver]: https://github.com/jeremyolliver
[@hannestyden]: https://github.com/hannestyden
[@geniou]: https://github.com/geniou
[@jkogara]: https://github.com/jkogara
[@tmorris-fiksu]: https://github.com/tmorris-fiksu
[@mockdeep]: https://github.com/mockdeep
[@hiroponz]: https://github.com/hiroponz
[@tamird]: https://github.com/tamird
[@fshowalter]: https://github.com/fshowalter
[@cschramm]: https://github.com/cschramm
[@bquorning]: https://github.com/bquorning
[@bcobb]: https://github.com/bcobb
[@irrationalfab]: https://github.com/irrationalfab
[@tommeier]: https://github.com/tommeier
[@sfeldon]: https://github.com/sfeldon
[@biinari]: https://github.com/biinari
[@barunio]: https://github.com/barunio
[@molawson]: https://github.com/molawson
[@wndhydrnt]: https://github.com/wndhydrnt
[@ggilder]: https://github.com/ggilder
[@salbertson]: https://github.com/salbertson
[@camilleldn]: https://github.com/camilleldn
[@mcls]: https://github.com/mcls
[@yous]: https://github.com/yous
[@vrthra]: https://github.com/vrthra
[@SkuliOskarsson]: https://github.com/SkuliOskarsson
[@jspanjers]: https://github.com/jspanjers
[@sch1zo]: https://github.com/sch1zo
[@smangelsdorf]: https://github.com/smangelsdorf
[@mvz]: https://github.com/mvz
[@jfelchner]: https://github.com/jfelchner
[@janraasch]: https://github.com/janraasch
[@jcarbo]: https://github.com/jcarbo
[@oneamtu]: https://github.com/oneamtu
[@toy]: https://github.com/toy
[@Koronen]: https://github.com/Koronen
[@blainesch]: https://github.com/blainesch
[@marxarelli]: https://github.com/marxarelli
[@katieschilling]: https://github.com/katieschilling
[@kakutani]: https://github.com/kakutani
[@rrosenblum]: https://github.com/rrosenblum
[@mattjmcnaughton]: https://github.com/mattjmcnaughton
[@huerlisi]: https://github.com/huerlisi
[@volkert]: https://github.com/volkert
[@lumeet]: https://github.com/lumeet
[@mmozuras]: https://github.com/mmozuras
[@d4rk5eed]: https://github.com/d4rk5eed
[@cshaffer]: https://github.com/cshaffer
[@eitoball]: https://github.com/eitoball
[@iainbeeston]: https://github.com/iainbeeston
[@pimterry]: https://github.com/pimterry
[@palkan]: https://github.com/palkan
[@jdoconnor]: https://github.com/jdoconnor
[@meganemura]: https://github.com/meganemura
[@zvkemp]: https://github.com/zvkemp
[@vassilevsky]: https://github.com/vassilevsky
[@gerry3]: https://github.com/gerry3
[@ypresto]: https://github.com/ypresto
[@clowder]: https://github.com/clowder
[@mudge]: https://github.com/mudge
[@mzp]: https://github.com/mzp
[@bankair]: https://github.com/bankair
[@crimsonknave]: https://github.com/crimsonknave
[@renuo]: https://github.com/renuo
[@sdeframond]: https://github.com/sdeframond
[@til]: https://github.com/til
[@carhartl]: https://github.com/carhartl
[@dylandavidson]: https://github.com/dylandavidson
[@tmr08c]: https://github.com/tmr08c
[@hbd225]: https://github.com/hbd225
[@l8nite]: https://github.com/l8nite
[@sumeet]: https://github.com/sumeet
[@ojab]: https://github.com/ojab
[@chastell]: https://github.com/chastell
[@glasnt]: https://github.com/glasnt
[@crazydog115]: https://github.com/crazydog115
[@RGBD]: https://github.com/RGBD
[@panthomakos]: https://github.com/panthomakos
[@matugm]: https://github.com/matugm
[@m1foley]: https://github.com/m1foley
[@tejasbubane]: https://github.com/tejasbubane
[@bmorrall]: https://github.com/bmorrall
[@fphilipe]: https://github.com/fphilipe
[@gotrevor]: https://github.com/gotrevor
[@awwaiid]: https://github.com/awwaiid
[@segiddins]: https://github.com/segiddins
[@urbanautomaton]: https://github.com/urbanautomaton.com
[@unmanbearpig]: https://github.com/unmanbearpig
[@maxjacobson]: https://github.com/maxjacobson
[@sliuu]: https://github.com/sliuu
[@edmz]: https://github.com/edmz
[@syndbg]: https://github.com/syndbg
[@wli]: https://github.com/wli
[@caseywebdev]: https://github.com/caseywebdev
[@MGerrior]: https://github.com/MGerrior
[@imtayadeway]: https://github.com/imtayadeway
[@mrfoto]: https://github.com/mrfoto
[@karreiro]: https://github.com/karreiro
[@dreyks]: https://github.com/dreyks
[@hmadison]: https://github.com/hmadison
[@miquella]: https://github.com/miquella
[@jhansche]: https://github.com/jhansche
[@cornelius]: https://github.com/cornelius
[@eagletmt]: https://github.com/eagletmt
[@apiology]: https://github.com/apiology
[@alexdowad]: https://github.com/alexdowad
[@minustehbare]: https://github.com/minustehbare
[@tansaku]: https://github.com/tansaku
[@ptrippett]: https://github.com/ptrippett
[@br3nda]: https://github.com/br3nda
[@jujugrrr]: https://github.com/jujugrrr
[@sometimesfood]: https://github.com/sometimesfood
[@cgriego]: https://github.com/cgriego
[@savef]: https://github.com/savef
[@volmer]: https://github.com/volmer
[@domcleal]: https://github.com/domcleal
[@codebeige]: https://github.com/codebeige
[@weh]: https://github.com/weh
[@bfontaine]: https://github.com/bfontaine
[@jawshooah]: https://github.com/jawshooah
[@DNNX]: https://github.com/DNNX
[@mvidner]: https://github.com/mvidner
[@mattparlane]: https://github.com/mattparlane
[@drenmi]: https://github.com/drenmi
[@georgyangelov]: https://github.com/georgyangelov
[@owst]: https://github.com/owst
[@seikichi]: https://github.com/seikichi
[@madwort]: https://github.com/madwort
[@annih]: https://github.com/annih
[@mmcguinn]: https://github.com/mmcguinn
[@pocke]: https://github.com/pocke
[@prsimp]: https://github.com/prsimp
[@ptarjan]: https://github.com/ptarjan
[@jweir]: https://github.com/jweir
[@Fryguy]: https://github.com/Fryguy
[@mikegee]: https://github.com/mikegee
[@tbrisker]: https://github.com/tbrisker
[@necojackarc]: https://github.com/necojackarc
[@laurelfan]: https://github.com/laurelfan
[@amuino]: https://github.com/amuino
[@dylanahsmith]: https://github.com/dylanahsmith
[@gerrywastaken]: https://github.com/gerrywastaken
[@bolshakov]: https://github.com/bolshakov
[@jastkand]: https://github.com/jastkand
[@graemeboy]: https://github.com/graemeboy
[@akihiro17]: https://github.com/akihiro17
[@magni-]: https://github.com/magni-
[@NobodysNightmare]: https://github.com/NobodysNightmare
[@gylaz]: https://github.com/gylaz
[@tjwp]: https://github.com/tjwp
[@neodelf]: https://github.com/neodelf
[@josh]: https://github.com/josh
[@natalzia-paperless]: https://github.com/natalzia-paperless
[@jules2689]: https://github.com/jules2689
[@giannileggio]: https://github.com/giannileggio
[@deivid-rodriguez]: https://github.com/deivid-rodriguez
[@pclalv]: https://github.com/pclalv
[@flexoid]: https://github.com/flexoid
[@sgringwe]: https://github.com/sgringwe
[@Tei]: https://github.com/Tei
[@haziqhafizuddin]: https://github.com/haziqhafizuddin
[@dvandersluis]: https://github.com/dvandersluis
[@QuinnHarris]: https://github.com/QuinnHarris
[@sooyang]: https://github.com/sooyang
[@metcalf]: https://github.com/metcalf
[@annaswims]: https://github.com/annaswims
[@soutaro]: https://github.com/soutaro
[@nicklamuro]: https://github.com/nicklamuro
[@mikezter]: https://github.com/mikezter
[@joejuzl]: https://github.com/joejuzl
[@hedgesky]: https://github.com/hedgesky
[@tjwallace]: https://github.com/tjwallace
[@scottohara]: https://github.com/scottohara
[@koic]: https://github.com/koic
[@groddeck]: https://github.com/groddeck
[@b-t-g]: https://github.com/b-t-g
[@coorasse]: https://github.com/coorasse
[@scottmatthewman]: https://github.com/scottmatthewman
[@tcdowney]: https://github.com/tcdowney
[@logicminds]: https://github.com/logicminds
[@abrom]: https://github.com/abrom
[@thegedge]: https://github.com/thegedge
[@jmks]: https://github.com/jmks/
[@connorjacobsen]: https://github.com/connorjacobsen
[@legendetm]: https://github.com/legendetm
[@bronson]: https://github.com/bronson
[@albus522]: https://github.com/albus522
[@sihu]: https://github.com/sihu
[@kamaradclimber]: https://github.com/kamaradclimber
[@swcraig]: https://github.com/swcraig
[@jessieay]: https://github.com/jessieay
[@tiagocasanovapt]: https://github.com/tiagocasanovapt
[@iGEL]: https://github.com/iGEL
[@tessi]: https://github.com/tessi
[@ivanovaleksey]: https://github.com/ivanovaleksey
[@Ana06]: https://github.com/Ana06
[@aroben]: https://github.com/aroben
[@olliebennett]: https://github.com/olliebennett
[@aesthetikx]: https://github.com/aesthetikx
[@tdeo]: https://github.com/tdeo
[@AlexWayfer]: https://github.com/AlexWayfer
[@amogil]: https://github.com/amogil
[@kevindew]: https://github.com/kevindew
[@lucasuyezu]: https://github.com/lucasuyezu
[@breckenedge]: https://github.com/breckenedge
[@enriikke]: https://github.com/enriikke
[@iguchi1124]: https://github.com/iguchi1124
[@vergenzt]: https://github.com/vergenzt
[@rahulcs]: https://github.com/rahulcs
[@dominh]: https://github.com/dominh
[@sue445]: https://github.com/sue445
[@zverok]: https://github.com/zverok
[@backus]: https://github.com/backus
[@pat]: https://github.com/pat
[@sinsoku]: https://github.com/sinsoku
[@nodo]: https://github.com/nodo
[@onk]: https://github.com/onk
[@dabroz]: https://github.com/dabroz
[@buenaventure]: https://github.com/buenaventure
[@dorian]: https://github.com/dorian
[@attilahorvath]: https://github.com/attilahorvath
[@droptheplot]: https://github.com/droptheplot
[@wkurniawan07]: https://github.com/wkurniawan07
[@kddeisz]: https://github.com/kddeisz
[@ota42y]: https://github.com/ota42y
[@smakagon]: https://github.com/smakagon
[@musialik]: https://github.com/musialik
[@twe4ked]: https://github.com/twe4ked
[@maxbeizer]: https://github.com/maxbeizer
[@andriymosin]: https://github.com/andriymosin
[@brandonweiss]: https://github.com/brandonweiss
[@betesh]: https://github.com/betesh
[@dpostorivo]: https://github.com/dpostorivo
[@konto-andrzeja]: https://github.com/konto-andrzeja
[@sadovnik]: https://github.com/sadovnik
[@cjlarose]: https://github.com/cjlarose
[@alpaca-tc]: https://github.com/alpaca-tc
[@ilansh]: https://github.com/ilansh
[@mclark]: https://github.com/mclark
[@klesse413]: https://github.com/klesse413
[@gprado]: https://github.com/gprado
[@yhirano55]: https://github.com/yhirano55
[@hoshinotsuyoshi]: https://github.com/hoshinotsuyoshi
