AppHost SlackLogger

/// AppHost.cs
public override void Configure(Container container)
{
  /// [...] 
  // register SlackLogger
  string incomingWebHookUrl = @"https://hooks.slack.com/services/xxxxxxxxxxx";
  var logger = new SlackLog.SlackLogger(incomingWebHookUrl);
  container.Register<ILog>(logger);
  
}