.rubocop.yml in arstotzka-1.2.4 vs .rubocop.yml in arstotzka-1.3.0

@@ -1,9 +1,9 @@
 require: rubocop-rspec
 inherit_from: .rubocop_todo.yml
 
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.5
 
 Metrics/BlockLength:
   Exclude:
     - 'spec/**/*_spec.rb'