.rubocop.yml in asciidoctor-iso-0.9.0 vs .rubocop.yml in asciidoctor-iso-0.9.1

@@ -8,8 +8,8 @@
   # Overrides from Ribose
   - ".rubocop.ribose.yml"
 AllCops:
   DisplayCopNames: false
   StyleGuideCopsOnly: false
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.5
 Rails:
   Enabled: true