.rubocop.yml in proxy_fetcher-0.5.1 vs .rubocop.yml in proxy_fetcher-0.6.0

@@ -1,8 +1,8 @@
 LineLength:
   Max: 120
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.1
   Exclude:
     - 'spec/**/*'
     - 'bin/*'
   DisplayCopNames: true
 Rails: