Swift ECS Logging Implementation

Just wanted to drop you a message to let you know that I've created a Swift logging implementation for logging in ECS log format:

[rwbutler/swift-log-ecs](https://github.com/rwbutler/swift-log-ecs)

It's intended to be used with Apple's [SwiftLog](https://github.com/apple/swift-log).

I created it to use myself with server-side Swift ([Vapor](https://vapor.codes)) but hopefully it will be of use to others as well. It can be combined with other log handlers allowing log messages to be sent to different logging backends.