.rubocop.yml in zache-0.5.0 vs .rubocop.yml in zache-0.5.1

- old
+ new

@@ -1,7 +1,7 @@
 AllCops:
   DisplayCopNames: true
-  TargetRubyVersion: 2.3.3
+  TargetRubyVersion: 2.5
 
 Metrics/ClassLength:
   Exclude:
     - 'test/*.rb'
 Layout/EmptyLineAfterGuardClause: