Gemfile in logstash-logger-0.12.0 vs Gemfile in logstash-logger-0.13.0

@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
 
 gemspec
 
-#gem 'json', :platform => :ruby_18
+gem 'codecov', require: false, group: :test