Update README.md (#301)

Author: kingychiu

README.md

@@ -72,7 +72,7 @@ print(completion.choices[0].text)
 
 
 ### Params
-All endpoints have a `.create` method that supports a `request_timeout` param.  This param takes a `Union[float, Tuple[float, float]]` and will raise an `openai.error.TimeoutError` error if the request exceeds that time in seconds (See: https://requests.readthedocs.io/en/latest/user/quickstart/#timeouts).
+All endpoints have a `.create` method that supports a `request_timeout` param.  This param takes a `Union[float, Tuple[float, float]]` and will raise an `openai.error.Timeout` error if the request exceeds that time in seconds (See: https://requests.readthedocs.io/en/latest/user/quickstart/#timeouts).
 
 ### Microsoft Azure Endpoints