.rubocop.yml in polyfill-0.4.0 vs .rubocop.yml in polyfill-0.5.0

@@ -1,6 +1,6 @@
 AllCops:
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.2
 Metrics/AbcSize:
   Enabled: false
 Metrics/BlockLength:
   Enabled: false
 Metrics/CyclomaticComplexity: