public bool Post(SlackMessage slackMessage)
 {
     var request = new RestRequest(_webhookUri.PathAndQuery, Method.POST);
     request.AddParameter("payload", slackMessage.ToJson());
     try
     {
         var response = _restClient.Execute(request);
         return response.StatusCode == HttpStatusCode.OK && response.Content == POST_SUCCESS;
     }
     catch (Exception)
     {
         return false;
     }
 }