.rubocop.yml in fontist-1.14.6 vs .rubocop.yml in fontist-1.15.0

@@ -1,5 +1,6 @@
 inherit_from:
   - 'https://raw.githubusercontent.com/fontist/oss-guides/master/ci/rubocop.yml'
 
 AllCops:
+  TargetRubyVersion: 2.7
   SuggestExtensions: false