.rubocop.yml in blacklight_oai_provider-6.0.0 vs .rubocop.yml in blacklight_oai_provider-6.1.0

@@ -2,9 +2,10 @@
 
 inherit_from:
   - .rubocop_todo.yml
 
 AllCops:
+  TargetRubyVersion: 2.3
   DisplayCopNames: true
   Exclude:
   - "blacklight_oai_provider.gemspec"
 
 Rails: