Added comment to Gemfile file

Author: jasnow

Gemfile

@@ -18,7 +18,7 @@ gem "powder" # Pow related gem
 gem "pry-rails" # not in dev group in case running via prod/staging @ a training
 gem "rails-perftest"
 gem "rake"
-gem "responders" #For Rails 4.2
+gem "responders" #For Rails 4.2 # LOCKED DOWN
 gem "ruby-prof"
 gem "sass-rails"
 gem "simplecov", require: false, group: :test