.rubocop.yml in fillable-pdf-0.9.5.2 vs .rubocop.yml in fillable-pdf-0.9.6

@@ -3,9 +3,10 @@
   - rubocop-minitest
   - rubocop-performance
   - rubocop-rake
 
 AllCops:
+  TargetRubyVersion: 2.4.0
   NewCops: enable
   Exclude:
     - .git/**/*
     - vendor/bundle/**/*