enable Style/MethodDefParentheses and fix parentheses

.rubocop.yml

@@ -322,7 +322,7 @@ Style/MethodCallParentheses:
 
 # Checks if the method definitions have or don't have parentheses.
 Style/MethodDefParentheses:
-  Enabled: false
+  Enabled: true
 
 # Use the configured style when naming methods.
 Style/MethodName:

lib/gitlab/email/receiver.rb

@@ -101,7 +101,7 @@ module Gitlab
           Project.find_with_namespace(reply_key) if reply_key
       end
 
-      def extract_reply project
+      def extract_reply(project)
         reply = ReplyParser.new(message).execute.strip
 
         raise EmptyEmailError if reply.blank?