Update rubocop-for-gem.yml

rails/rubocop-for-gem.yml

@@ -85,11 +85,15 @@ Metrics/PerceivedComplexity:
 # BEGIN Naming
 # the default gem module must be named like the gem, so allow dashes
 Naming/FileName:
-  Exclude: [./lib/*.rb]
+  Exclude: ['lib/*.rb']
 # END Naming
 
 
 # BEGIN Style
+# allow compact style for gems that contain app directory for rails integration
+Style/ClassAndModuleChildren:
+  Exclude: ['app/**/*']
+
 # documentation of classes in migrations and tests is not needed
 Style/Documentation:
   Exclude: *test_config_db