provider to Provider in testing

testing/test_chat_completion.py

@@ -8,7 +8,7 @@ import g4f
 stream = False
 response = g4f.ChatCompletion.create(
     model="gpt-3.5-turbo",
-    provider=g4f.provider.Ails,
+    provider=g4f.Provider.Ails,
     messages=[{"role": "user", "content": "hello"}],
     stream=stream,
     active_server=5,