Redis is now only needed if you want to use Action Cable in production

So no need to have it on by default in the Gemfile.

railties/lib/rails/generators/app_base.rb

@@ -352,9 +352,9 @@ def psych_gemfile_entry
 
       def cable_gemfile_entry
         return [] if options[:skip_action_cable]
-        comment = 'Action Cable dependencies for the Redis adapter'
+        comment = 'Use Redis adapter to run Action Cable in production'
         gems = []
-        gems << GemfileEntry.new("redis", '~> 3.0', comment)
+        gems << GemfileEntry.new("redis", '~> 3.0', comment, {}, true)
         gems
       end