Add trailing newline for linter

Author: adhilto

scubagoggles/config.py

@@ -227,4 +227,4 @@ def _validate(self, keys: Iterable = None) -> Union[list, None]:
             for key in current_doc:
                 bad_keys += self._validate([*keys, key])
 
-        return bad_keys
+        return bad_keys