Add `Style/RedundantFreeze` to remove redudant `.freeze`

Since Rails 6.0 will support Ruby 2.4.1 or higher
`# frozen_string_literal: true` magic comment is enough to make string object frozen.
This magic comment is enabled by `Style/FrozenStringLiteralComment` cop.

* Exclude these files not to auto correct false positive `Regexp#freeze`
 - 'actionpack/lib/action_dispatch/journey/router/utils.rb'
 - 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb'

It has been fixed by https://github.com/rubocop-hq/rubocop/pull/6333
Once the newer version of RuboCop released and available at Code Climate these exclude entries should be removed.

* Replace `String#freeze` with `String#-@` manually if explicit frozen string objects are required

 - 'actionpack/test/controller/test_case_test.rb'
 - 'activemodel/test/cases/type/string_test.rb'
 - 'activesupport/lib/active_support/core_ext/string/strip.rb'
 - 'activesupport/test/core_ext/string_ext_test.rb'
 - 'railties/test/generators/actions_test.rb'

1 files changed, 6 insertions, 6 deletions

diff --git a/actioncable/lib/action_cable.rb b/actioncable/lib/action_cable.rb
index 35eacc2f4f..d261d4112e 100644
--- a/actioncable/lib/action_cable.rb
+++ b/actioncable/lib/action_cable.rb
@@ -32,13 +32,13 @@ module ActionCable
 
   INTERNAL = {
     message_types: {
-      welcome: "welcome".freeze,
-      ping: "ping".freeze,
-      confirmation: "confirm_subscription".freeze,
-      rejection: "reject_subscription".freeze
+      welcome: "welcome",
+      ping: "ping",
+      confirmation: "confirm_subscription",
+      rejection: "reject_subscription"
     },
-    default_mount_path: "/cable".freeze,
-    protocols: ["actioncable-v1-json".freeze, "actioncable-unsupported".freeze].freeze
+    default_mount_path: "/cable",
+    protocols: ["actioncable-v1-json", "actioncable-unsupported"].freeze
   }
 
   # Singleton instance of the server