Prevent multiple values for keyword argument 'audience' in jwt.decode() (#8)

* Prevent multiple values for keyword argument 'audience' in jwt.decode()
* Replace dict filtering with a call to pop()

Thanks to @eugenejo and @nkoshell

Author: eugenejo

src/keycloak/openid_connect.py

@@ -93,7 +93,7 @@ def decode_token(self, token, key, algorithms=None, **kwargs):
             way.
         """
         return jwt.decode(token, key,
-                          audience=kwargs.get('audience') or self._client_id,
+                          audience=kwargs.pop('audience', None) or self._client_id,
                           algorithms=algorithms or ['RS256'], **kwargs)
 
     def logout(self, refresh_token):