### New features

* [#5101](https://github.com/rubocop/rubocop/pull/5101): Allow to specify `TargetRubyVersion` 2.5. ([@walf443][])
* [#1575](https://github.com/rubocop/rubocop/issues/1575): Add new `Layout/ClassStructure` cop that checks whether definitions in a class are in the configured order. This cop is disabled by default. ([@jonatas][])
* New cop `Rails/InverseOf` checks for association arguments that require setting the `inverse_of` option manually. ([@bdewater][])
* [#4811](https://github.com/rubocop/rubocop/issues/4811): Add new `Layout/SpaceInsideReferenceBrackets` cop. ([@garettarrowood][])
* [#4811](https://github.com/rubocop/rubocop/issues/4811): Add new `Layout/SpaceInsideArrayLiteralBrackets` cop. ([@garettarrowood][])
* [#4252](https://github.com/rubocop/rubocop/issues/4252): Add new `Style/TrailingBodyOnMethodDefinition` cop. ([@garettarrowood][])
* Add new `Style/TrailingMethodEndStatement` cop. ([@garettarrowood][])
* [#5074](https://github.com/rubocop/rubocop/issues/5074): Add Layout/EmptyLinesAroundArguments cop. ([@garettarrowood][])
* [#4650](https://github.com/rubocop/rubocop/issues/4650): Add new `Style/StringHashKeys` cop. ([@donjar][])
* [#1583](https://github.com/rubocop/rubocop/issues/1583): Add a quiet formatter. ([@drenmi][])
* Add new `Style/RandomWithOffset` cop. ([@donjar][])
* [#4892](https://github.com/rubocop/rubocop/issues/4892): Add new `Lint/ShadowedArgument` cop and remove argument shadowing detection from `Lint/UnusedBlockArgument` and `Lint/UnusedMethodArgument`. ([@akhramov][])
* [#4674](https://github.com/rubocop/rubocop/issues/4674): Add a new `Lint/MissingCopEnableDirective` cop. ([@tdeo][])
* Add new `Rails/EnvironmentComparison` cop. ([@tdeo][])
* Add `AllowedChars` option to `Style/AsciiComments` cop. ([@hedgesky][])
* [#5031](https://github.com/rubocop/rubocop/pull/5031): Add new `Style/EmptyBlockParameter` and `Style/EmptyLambdaParameter` cops. ([@pocke][])
* [#5057](https://github.com/rubocop/rubocop/pull/5057): Add new `Gemspec/RequiredRubyVersion` cop. ([@koic][])
* [#5087](https://github.com/rubocop/rubocop/pull/5087): Add new `Gemspec/RedundantAssignment` cop. ([@koic][])
* Add `unannotated` option to `Style/FormatStringToken` cop. ([@drenmi][])
* [#5077](https://github.com/rubocop/rubocop/pull/5077): Add new `Rails/CreateTableWithTimestamps` cop. ([@wata727][])
* Add new `Style/ColonMethodDefinition` cop. ([@rrosenblum][])
* Add new `Style/ExtendSelf` cop. ([@drenmi][])
* [#5185](https://github.com/rubocop/rubocop/pull/5185): Add new `Rails/RedundantReceiverInWithOptions` cop. ([@koic][])
* [#5177](https://github.com/rubocop/rubocop/pull/5177): Add new `Rails/LexicallyScopedActionFilter` cop. ([@wata727][])
* [#5173](https://github.com/rubocop/rubocop/pull/5173): Add new `Style/EvalWithLocation` cop. ([@pocke][])
* [#5208](https://github.com/rubocop/rubocop/pull/5208): Add new `Rails/Presence` cop. ([@wata727][])

### Bug fixes

* [#5096](https://github.com/rubocop/rubocop/issues/5096): Fix incorrect detection and autocorrection of multiple extend/include/prepend. ([@marcandre][])
* [#5219](https://github.com/rubocop/rubocop/issues/5219): Fix incorrect empty line detection for block arguments in `Layout/EmptyLinesAroundArguments`. ([@garettarrowood][])
* [#4662](https://github.com/rubocop/rubocop/issues/4662): Fix incorrect indent level detection when first line of heredoc is blank. ([@sambostock][])
* [#5016](https://github.com/rubocop/rubocop/issues/5016): Fix a false positive for `Style/ConstantName` with constant names using non-ASCII capital letters with accents. ([@timrogers][])
* [#4866](https://github.com/rubocop/rubocop/issues/4866): Prevent `Layout/BlockEndNewline` cop from introducing trailing whitespaces. ([@bgeuken][])
* [#3396](https://github.com/rubocop/rubocop/issues/3396): Concise error when config. file not found. ([@jaredbeck][])
* [#4881](https://github.com/rubocop/rubocop/issues/4881): Fix a false positive for `Performance/HashEachMethods` when unused argument(s) exists in other blocks. ([@pocke][])
* [#4883](https://github.com/rubocop/rubocop/pull/4883): Fix auto-correction for `Performance/HashEachMethods`. ([@pocke][])
* [#4896](https://github.com/rubocop/rubocop/pull/4896): Fix Style/DateTime wrongly triggered on classes `...::DateTime`. ([@dpostorivo][])
* [#4938](https://github.com/rubocop/rubocop/pull/4938): Fix behavior of `Lint/UnneededDisable`, which was returning offenses even after being disabled in a comment. ([@tdeo][])
* [#4887](https://github.com/rubocop/rubocop/pull/4887): Add undeclared configuration option `EnforcedStyleForEmptyBraces` for `Layout/SpaceBeforeBlockBraces` cop. ([@drenmi][])
* [#4987](https://github.com/rubocop/rubocop/pull/4987): Skip permission check when using stdin option. ([@mtsmfm][])
* [#4909](https://github.com/rubocop/rubocop/issues/4909): Make `Rails/HasManyOrHasOneDependent` aware of multiple associations in `with_options`. ([@koic][])
* [#4794](https://github.com/rubocop/rubocop/issues/4794): Fix an error in `Layout/MultilineOperationIndentation` when an operation spans multiple lines and contains a ternary expression. ([@rrosenblum][])
* [#4885](https://github.com/rubocop/rubocop/issues/4885): Fix false offense detected by `Style/MixinUsage` cop. ([@koic][])
* [#3363](https://github.com/rubocop/rubocop/pull/3363): Fix `Style/EmptyElse` autocorrection removes comments from branches. ([@dpostorivo][])
* [#5025](https://github.com/rubocop/rubocop/issues/5025): Fix error with Layout/MultilineMethodCallIndentation cop and lambda.(...). ([@dpostorivo][])
* [#4781](https://github.com/rubocop/rubocop/issues/4781): Prevent `Style/UnneededPercentQ` from breaking on strings that are concatenated with backslash. ([@pocke][])
* [#4363](https://github.com/rubocop/rubocop/issues/4363): Fix `Style/PercentLiteralDelimiters` incorrectly automatically modifies escaped percent literal delimiter. ([@koic][])
* [#5053](https://github.com/rubocop/rubocop/issues/5053): Fix `Naming/ConstantName` false offense on assigning to a nonoffensive assignment. ([@garettarrowood][])
* [#5019](https://github.com/rubocop/rubocop/pull/5019): Fix auto-correct for `Style/HashSyntax` cop when hash is used as unspaced argument. ([@drenmi][])
* [#5052](https://github.com/rubocop/rubocop/pull/5052): Improve accuracy of `Style/BracesAroundHashParameters` auto-correction. ([@garettarrowood][])
* [#5059](https://github.com/rubocop/rubocop/issues/5059): Fix a false positive for `Style/MixinUsage` when `include` call is a method argument. ([@koic][])
* [#5071](https://github.com/rubocop/rubocop/pull/5071): Fix a false positive in `Lint/UnneededSplatExpansion`, when `Array.new` resides in an array literal. ([@akhramov][])
* [#4071](https://github.com/rubocop/rubocop/issues/4071): Prevent generating wrong code by Style/ColonMethodCall and Style/RedundantSelf. ([@pocke][])
* [#5089](https://github.com/rubocop/rubocop/issues/5089): Fix false positive for `Style/SafeNavigation` when safe guarding arithmetic operation or assignment. ([@tiagotex][])
* [#5099](https://github.com/rubocop/rubocop/pull/5099): Prevent `Style/MinMax` from breaking on implicit receivers. ([@drenmi][])
* [#5079](https://github.com/rubocop/rubocop/issues/5079): Fix false positive for `Style/SafeNavigation` when safe guarding comparisons. ([@tiagotex][])
* [#5075](https://github.com/rubocop/rubocop/issues/5075): Fix auto-correct for `Style/RedundantParentheses` cop when unspaced ternary is present. ([@tiagotex][])
* [#5155](https://github.com/rubocop/rubocop/issues/5155): Fix a false negative for `Naming/ConstantName` cop when using frozen object assignment. ([@koic][])
* Fix a false positive in `Style/SafeNavigation` when the right hand side is negated. ([@rrosenblum][])
* [#5128](https://github.com/rubocop/rubocop/issues/5128): Fix `Bundler/OrderedGems` when gems are references from variables (ignores them in the sorting). ([@tdeo][])

### Changes

* [#4848](https://github.com/rubocop/rubocop/pull/4848): Exclude lambdas and procs from `Metrics/ParameterLists`. ([@reitermarkus][])
* [#5120](https://github.com/rubocop/rubocop/pull/5120):  Improve speed of RuboCop::PathUtil#smart_path. ([@walf443][])
* [#4888](https://github.com/rubocop/rubocop/pull/4888): Improve offense message of `Style/StderrPuts`. ([@jaredbeck][])
* [#4886](https://github.com/rubocop/rubocop/issues/4886): Fix false offense for Style/CommentedKeyword. ([@michniewicz][])
* [#4977](https://github.com/rubocop/rubocop/pull/4977): Make `Lint/RedundantWithIndex` cop aware of offset argument. ([@koic][])
* [#2679](https://github.com/rubocop/rubocop/issues/2679): Handle dependencies to `Metrics/LineLength: Max` when generating `.rubocop_todo.yml`. ([@jonas054][])
* [#4943](https://github.com/rubocop/rubocop/pull/4943): Make cop generator compliant with the repo's rubocop config. ([@tdeo][])
* [#5011](https://github.com/rubocop/rubocop/pull/5011): Remove `SupportedStyles` from "Configuration parameters" in `.rubocop_todo.yml`. ([@pocke][])
* `Lint/RescueWithoutErrorClass` has been replaced by `Style/RescueStandardError`. ([@rrosenblum][])
* [#4811](https://github.com/rubocop/rubocop/issues/4811): Remove `Layout/SpaceInsideBrackets` in favor of two new configurable cops. ([@garettarrowood][])
* [#5042](https://github.com/rubocop/rubocop/pull/5042): Make offense locations of metrics cops to contain whole a method. ([@pocke][])
* [#5044](https://github.com/rubocop/rubocop/pull/5044): Add last_line and last_column into outputs of the JSON formatter. ([@pocke][])
* [#4633](https://github.com/rubocop/rubocop/issues/4633): Make metrics cops aware of `define_method`. ([@pocke][])
* [#5037](https://github.com/rubocop/rubocop/pull/5037): Make display cop names to enable by default. ([@pocke][])
* [#4449](https://github.com/rubocop/rubocop/issues/4449): Make `Layout/IndentHeredoc` aware of line length. ([@pocke][])
* [#5146](https://github.com/rubocop/rubocop/pull/5146): Make `--show-cops` option aware of `--force-default-config`. ([@pocke][])
* [#3001](https://github.com/rubocop/rubocop/issues/3001): Add configuration to `Lint/MissingCopEnableDirective` cop. ([@tdeo][])
* [#4932](https://github.com/rubocop/rubocop/issues/4932): Do not fail if configuration contains `Lint/Syntax` cop with the same settings as the default. ([@tdeo][])
* [#5175](https://github.com/rubocop/rubocop/pull/5175): Make Style/RedundantBegin aware of do-end block in Ruby 2.5. ([@pocke][])

[@walf443]: https://github.com/walf443
[@jonatas]: https://github.com/jonatas
[@bdewater]: https://github.com/bdewater
[@garettarrowood]: https://github.com/garettarrowood
[@donjar]: https://github.com/donjar
[@drenmi]: https://github.com/drenmi
[@akhramov]: https://github.com/akhramov
[@tdeo]: https://github.com/tdeo
[@hedgesky]: https://github.com/hedgesky
[@pocke]: https://github.com/pocke
[@koic]: https://github.com/koic
[@wata727]: https://github.com/wata727
[@rrosenblum]: https://github.com/rrosenblum
[@marcandre]: https://github.com/marcandre
[@sambostock]: https://github.com/sambostock
[@timrogers]: https://github.com/timrogers
[@bgeuken]: https://github.com/bgeuken
[@jaredbeck]: https://github.com/jaredbeck
[@dpostorivo]: https://github.com/dpostorivo
[@mtsmfm]: https://github.com/mtsmfm
[@tiagotex]: https://github.com/tiagotex
[@reitermarkus]: https://github.com/reitermarkus
[@michniewicz]: https://github.com/michniewicz
[@jonas054]: https://github.com/jonas054
