Watch gems.locked instead of Gemfile.lock when using gems.rb

Author: Sixeight

lib/spring/application.rb

@@ -117,7 +117,7 @@ def preload
       raise e unless initialized?
     ensure
       watcher.add loaded_application_features
-      watcher.add Spring.gemfile, "#{Spring.gemfile}.lock"
+      watcher.add Spring.gemfile, Spring.gemfile_lock
 
       if defined?(Rails) && Rails.application
         watcher.add Rails.application.paths["config/initializers"]