Gemfile in mock_redis-0.26.0 vs Gemfile in mock_redis-0.27.0

@@ -7,6 +7,8 @@
 gem 'overcommit', '0.53.0'
 
 # Pin tool versions (which are executed by Overcommit) for Travis builds
 gem 'rubocop', '0.82.0'
 
+gem 'ruby2_keywords'
+
 gem 'coveralls', require: false