Gemfile in link_thumbnailer-1.1.2 vs Gemfile in link_thumbnailer-2.0.0

@@ -1,10 +1,10 @@
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in link_thumbnailer.gemspec
 gemspec
 
-group :test do
+group :development, :test do
   gem 'coveralls',  require: false
   gem 'simplecov',  require: false
   gem 'rspec',      '~> 2.14'
   gem 'webmock',    '~> 1.14'
   gem 'pry',        '~> 0.9'