.rubocop.yml in jekyll-json-feed-1.0.0 vs .rubocop.yml in jekyll-json-feed-1.0.1

@@ -1,9 +1,10 @@
+require: rubocop-jekyll
 inherit_gem:
-  jekyll: .rubocop.yml
+  rubocop-jekyll: .rubocop.yml
 
 AllCops:
-  TargetRubyVersion: 2.0
+  TargetRubyVersion: 2.4
   Include:
     - lib/*.rb
 
   Exclude:
     - .rubocop.yml