Gemfile in sanitize_email-2.0.0 vs Gemfile in sanitize_email-2.0.1

@@ -1,13 +1,26 @@
-source "http://rubygems.org"
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
+
+group :test do
+  ruby_version = Gem::Version.new(RUBY_VERSION)
+  if ruby_version >= Gem::Version.new('2.1')
+    gem 'rubocop', '~> 0.53.0'
+    gem 'rubocop-rspec', '~> 1.24.0'
+  end
+  gem 'byebug' if ruby_version >= Gem::Version.new('2.0')
+end
 
 # Specify your gem's dependencies in sanitize_email.gemspec
 gemspec