Gemfile in mailerlite-0.1.0 vs Gemfile in mailerlite-0.2.0

@@ -6,9 +6,10 @@
 
 group :test do
   gem 'codeclimate-test-reporter', require: false
   gem 'coveralls',    '~> 0.8.13', require: false
   gem 'guard-rspec',  '~> 4.6.5'
+  gem 'rake' # For Travis CI
   gem 'simplecov',    '~> 0.11.2', require: false
   gem 'webmock',      '~> 1.24.3'
 end
 
 gemspec