.rubocop.yml in jekyll-feed-0.12.0 vs .rubocop.yml in jekyll-feed-0.12.1

@@ -2,10 +2,10 @@
 
 inherit_gem:
   rubocop-jekyll: .rubocop.yml
 
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.3
   Include:
     - lib/**/*.rb
 
   Exclude:
     - .gitignore