Make Reply by email easier to configure

lib/gitlab/incoming_email.rb

@@ -24,12 +24,12 @@ module Gitlab
         match[1]
       end
 
-      private
-
       def config
         Gitlab.config.incoming_email
       end
 
+      private
+
       def address_regex
         wildcard_address = config.address
         return nil unless wildcard_address