Production ready solution

[taraspos]

This code is only an example that doesn't seem to be maintained as well.

We at GetSocial wrote production-ready (we are using it in production for years) and more feature rich (spot instances draining) version: https://github.com/getsocial-rnd/ecs-drain-lambda

What do you think about archiving this repo and creating a link to our tool? Thanks!