Unmark AutoCorrect: false from Rails/UniqBeforePluck

This `AutoCorrect: false` looks like it was set when there was no way
to safe autocorrect by `SafeAutocorrect: false`.

Test code for the autocorrection exists. So it can be enabled by default.
However, it is still unsafe because `SafeAutocorrect: false`.

Author: koic

changelog/change_unmark_autocorrect_false_from_rails_uniq_before_pluck.md

@@ -0,0 +1 @@
+* [#580](https://github.com/rubocop/rubocop-rails/pull/580): Unmark `AutoCorrect: false` from `Rails/UniqBeforePluck`. ([@koic][])

config/default.yml

@@ -820,13 +820,12 @@ Rails/UniqBeforePluck:
   Description: 'Prefer the use of uniq or distinct before pluck.'
   Enabled: true
   VersionAdded: '0.40'
-  VersionChanged: '2.8'
+  VersionChanged: '2.13'
   EnforcedStyle: conservative
   SupportedStyles:
     - conservative
     - aggressive
   SafeAutoCorrect: false
-  AutoCorrect: false
 
 Rails/UniqueValidationWithoutIndex:
   Description: 'Uniqueness validation should have a unique index on the database column.'

docs/modules/ROOT/pages/cops_rails.adoc

@@ -4875,7 +4875,7 @@ end
 | Yes
 | Yes (Unsafe)
 | 0.40
-| 2.8
+| 2.13
 |===
 
 Prefer the use of distinct, before pluck instead of after.
@@ -4940,10 +4940,6 @@ Model.distinct.pluck(:id)
 | EnforcedStyle
 | `conservative`
 | `conservative`, `aggressive`
-
-| AutoCorrect
-| `false`
-| Boolean
 |===
 
 == Rails/UniqueValidationWithoutIndex