Gemfile in wovn-reverse_proxy-0.0.1 vs Gemfile in wovn-reverse_proxy-0.1.0

@@ -1,4 +1,8 @@
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in wovn-reverse_proxy.gemspec
 gemspec
+
+if Gem::Version.create(RUBY_VERSION) < Gem::Version.create('2.2.2')
+  gem 'rack', '>= 1.6.4', '< 2.0.0'
+end