adapt gemfile

hawk/Gemfile

@@ -26,15 +26,7 @@ gem "gettext_i18n_rails", ">= 1.8"
 gem "gettext_i18n_rails_js", ">= 1.3"
 gem "sprockets", ">= 3.7"
 gem "kramdown", ">= 1.14"
-
-group :development do
-  source "https://rubygems.org"
-  gem "web-console", ">= 3.5"
-  gem "spring", ">= 2.0"
-  gem "uglifier", ">= 3"
-  gem "gettext", ">= 3.2", require: false
-  gem "byebug"
-end
+gem "uglifier", ">= 3"
 
 group :test do
   if ENV["RAILS_ENV"] == "test"