Add missed comma

g4f/client/async_client.py

@@ -144,7 +144,7 @@ class Completions():
             proxy=self.client.get_proxy() if proxy is None else proxy,
             max_tokens=max_tokens,
             stop=stop,
-            api_key=self.client.api_key if api_key is None else api_key
+            api_key=self.client.api_key if api_key is None else api_key,
             **kwargs
         )
         response = iter_response(response, stream, response_format, max_tokens, stop)
@@ -207,4 +207,4 @@ class Images():
             result = iter_image_response(response)
         if result is None:
             raise NoImageResponseError()
-        return result
+        return result