Update serpapi/core.py

Co-authored-by: bart <bart@serpapi.com>

Author: Kenneth Reitz

serpapi/core.py

@@ -136,7 +136,7 @@ def account(self, params: dict = None, **kwargs):
         return r.json()
 
 
-# An un-authenticated client instance, .
+# An un-authenticated client instance.
 _client = Client()
 search = _client.search
 search_archive = _client.search_archive