public async Task Say(BotMessage message)
{
if (string.IsNullOrEmpty(message.ChatHub?.Id))
{
throw new MissingChannelException("When calling the Say() method, the message parameter must have its ChatHub property set.");
}
var client = _connectionFactory.CreateChatMessenger();
await client.PostMessage(SlackKey, message.ChatHub.Id, message.Text, message.Attachments);
}