### New features

* [#2798](https://github.com/rubocop/rubocop/pull/2798): `Rails/FindEach` cop works with `where.not`. ([@pocke][])
* `Style/MultilineBlockLayout` can correct offenses which involve argument destructuring. ([@alexdowad][])
* `Style/SpaceAroundKeyword` checks `super` nodes with no args. ([@alexdowad][])
* `Style/SpaceAroundKeyword` checks `defined?` nodes. ([@alexdowad][])
* [#2719](https://github.com/rubocop/rubocop/issues/2719): `Style/ConditionalAssignment` handles correcting the alignment of `end`. ([@rrosenblum][])

### Bug fixes

* Fix auto-correction of `not` with parentheses in `Style/Not`. ([@lumeet][])
* [#2784](https://github.com/rubocop/rubocop/issues/2784): RuboCop can inspect `super { ... }` and `super(arg) { ... }`. ([@alexdowad][])
* [#2781](https://github.com/rubocop/rubocop/issues/2781): `Performance/RedundantMerge` doesn't flag calls to `#update`, since many classes have methods by this name (not only `Hash`). ([@alexdowad][])
* [#2780](https://github.com/rubocop/rubocop/issues/2780): `Lint/DuplicateMethods` does not flag method definitions inside dynamic `Class.new` blocks. ([@alexdowad][])
* [#2775](https://github.com/rubocop/rubocop/issues/2775): `Style/SpaceAroundKeyword` doesn't flag `yield.method`. ([@alexdowad][])
* [#2774](https://github.com/rubocop/rubocop/issues/2774): `Style/SpaceAroundOperators` doesn't flag calls to `#[]`. ([@alexdowad][])
* [#2772](https://github.com/rubocop/rubocop/issues/2772): RuboCop doesn't crash when `AllCops` section in configuration file is empty (rather, it displays a warning as intended). ([@alexdowad][])
* [#2737](https://github.com/rubocop/rubocop/issues/2737): `Style/GuardClause` handles `elsif` clauses correctly. ([@alexdowad][])
* [#2735](https://github.com/rubocop/rubocop/issues/2735): `Style/MultilineBlockLayout` doesn't cause an infinite loop by moving `end` onto the same line as the block args. ([@alexdowad][])
* [#2715](https://github.com/rubocop/rubocop/issues/2715): `Performance/RedundantMatch` doesn't flag calls to `#match` which take a block. ([@alexdowad][])
* [#2704](https://github.com/rubocop/rubocop/issues/2704): `Lint/NestedMethodDefinition` doesn't flag singleton defs which define a method on the value of a local variable. ([@alexdowad][])
* [#2660](https://github.com/rubocop/rubocop/issues/2660): `Style/TrailingUnderscoreVariable` shows recommended code in its offense message. ([@alexdowad][])
* [#2671](https://github.com/rubocop/rubocop/issues/2671): `Style/WordArray` doesn't attempt to inspect strings with invalid encoding, to avoid failing with an encoding error. ([@alexdowad][])

### Changes

* [#2739](https://github.com/rubocop/rubocop/issues/2739): Change the configuration option `when_needed` in `Style/FrozenStringLiteralComment` to add a `frozen_string_literal` comment to all files when the `TargetRubyVersion` is set to 2.3+. ([@rrosenblum][])

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[@DNNX]: https://github.com/DNNX
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[@madwort]: https://github.com/madwort
[@annih]: https://github.com/annih
[@mmcguinn]: https://github.com/mmcguinn
[@pocke]: https://github.com/pocke
