.rubocop.yml in grape-jwt-authentication-2.3.0 vs .rubocop.yml in grape-jwt-authentication-2.4.0

@@ -10,10 +10,10 @@
 
 AllCops:
   NewCops: enable
   SuggestExtensions: false
   DisplayCopNames: true
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.7
   TargetRailsVersion: 5.2
   Exclude:
     - bin/**/*
     - vendor/**/*
     - build/**/*