Don't block requests on log calls

[deviantintegral]

https://github.com/nohponex/monolog-datadog-handler/blob/master/src/DataDogHandler.php#L79 calls event(), which is documented as a blocking call:

https://github.com/DataDog/php-datadogstatsd/blob/master/src/DogStatsd.php#L383-L393

While there's code in event() to send over UDP, since we set an API key it's back to TCP: https://github.com/DataDog/php-datadogstatsd/blob/master/src/DogStatsd.php#L88-L90

A few options I see:

• Document that this handler should be wrapped in another handler that batches events and sends them on shutdown / destruct.
• Use BatchedDogStatsd instead of DogStatsd.
• Use the DogStatsd class, but see if we can send over UDP?

[deviantintegral]

I missed that this library creates events and not logs in DataDog. While the above would be a good enhancement, I'll be using a different handler instead and won't be working on this myself.