polyfill.gemspec in polyfill-0.6.0 vs polyfill.gemspec in polyfill-0.7.0

@@ -11,10 +11,10 @@
 
   spec.summary  = 'Adds newer Ruby methods to older versions.'
   spec.homepage = ''
   spec.license  = 'MIT'
 
-  spec.required_ruby_version = '>= 2.2'
+  spec.required_ruby_version = '>= 2.1'
 
   spec.files = `git ls-files -z`.split("\x0").reject do |f|
     f.match(%r{^(test|spec|features)/})
   end
   spec.bindir        = 'exe'