Gemfile in ballast-2.2.3 vs Gemfile in ballast-2.2.4

@@ -15,6 +15,7 @@
 gem "simplecov", "~> 0.11"
 gem "coveralls", "~> 0.8", require: false
 gem "pry", "~> 0.10"
 gem "yard", "~> 0.8"
 gem "kramdown", "~> 1.10"
-gem "github-markup", "~> 1.4"
+gem "github-markup", "~> 1.4"
+gem "rubocop", "~> 0.39"
\ No newline at end of file