Do not raise exception on unknown fields (#151)

Author: davidzhao

livekit-api/livekit/api/webhook.py

@@ -18,4 +18,4 @@ def receive(self, body: str, auth_token: str) -> proto_webhook.WebhookEvent:
         if body_hash != claims_hash:
             raise Exception("hash mismatch")
 
-        return Parse(body, proto_webhook.WebhookEvent())
+        return Parse(body, proto_webhook.WebhookEvent(), ignore_unknown_fields=True)