Gemfile in cello-0.0.19 vs Gemfile in cello-0.0.21

@@ -7,7 +7,8 @@
 gem 'rake'
 gem 'headless'
 gem 'rspec'
 gem "nyan-cat-formatter"
 gem "sourcify", "~> 0.5.0"
+gem 'coveralls', require: false
 
 gemspec