.rubocop.yml in shoryuken-5.0.4 vs .rubocop.yml in shoryuken-5.0.5

@@ -1,8 +1,8 @@
 AllCops:
   Exclude:
     - '**/Gemfile'
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.4
 
 Metrics/PerceivedComplexity:
   Enabled: false
 
 Metrics/CyclomaticComplexity: