Update README.md

Fixed Webhooks link

Author: michellewong27

README.md

@@ -119,6 +119,6 @@ All the documentation for this project lives in the /docs directory of this repo
 | Messages | [docs/MessagesApi.md](docs/MessagesApi.md)  |
 | OpenChannel | [docs/OpenChannelApi.md ](docs/OpenChannelApi.md)  |
 | User | [docs/UserApi.md](docs/UserApi.md)  |
-| Webhooks | [docs/UserApi.md](docs/WebhooksApi.md)  |
+| Webhooks | [docs/WebhooksApi.md](docs/WebhooksApi.md)  |