[Fix rubocop#5976] Remove Rails cops

Fixes rubocop#5976. This PR removes Rails department from RuboCop core. - Remove Rails department cops - Remove `-R/--rails` option from `rubocop` command These were transferred to RuboCop Rails gem. https://github.com/rubocop-hq/rubocop-rails Some internal implementations of `TargetRailsVersion` remain. The final goal in the near future is to extract `TargetRailsVersion` implementation to RuboCop Rails from RuboCop core. rubocop/rubocop-rails#47 This PR aims removing Rails cops and `rubocop -R /-rails` option that affect RuboCop 0.72.0 users. It may be better to merge this PR when we decide the next release version is RuboCop 0.72.
koic · May 31, 2019 · f363432 · f363432
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 ## master (unreleased)
 
+### Changes
+
+* [#5976](https://github.com/rubocop-hq/rubocop/issues/5976): Remove Rails cops. ([@koic][])
+* [#5976](https://github.com/rubocop-hq/rubocop/issues/5976): Remove `rubocop -R/--rails` option. ([@koic][])
+
 ## 0.71.0 (2019-05-30)
 
 ### New features

diff --git a/README.md b/README.md
@@ -75,10 +75,6 @@ RuboCop supports the following Ruby implementations:
 * MRI 2.3+
 * JRuby 9.1+
 
-The Rails cops support the following versions:
-
-* Rails 4.0+
-
 ## Team
 
 Here's a list of RuboCop's core developers: