updateHook(id, options, cb) {
      return this._request('PATCH', `/repos/${this.__fullname}/hooks/${id}`, options, cb);
   }
Edit an existing webhook
@see https://developer.github.com/v3/repos/hooks/#edit-a-hook
@param {number} id - the id of the webhook
@param {Object} options - the new description of the webhook
@param {Requestable.callback} cb - will receive the updated webhook
@return {Promise} - the promise for the http request