.rubocop.yml in api-auth-2.3.1 vs .rubocop.yml in api-auth-2.4.0

- old
+ new

@@ -1,8 +1,8 @@
 inherit_from: .rubocop_todo.yml
 
 AllCops:
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.4
 
 Metrics/AbcSize:
   Max: 25
 
 # Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.