So I just noticed Phoenix uses Cowboy 1.0 while version 2.0 already exists. I’m wondering if there are plans to migrate Phoenix to Cowboy 2.0? Does anyone know if it works nicely with this new version?
I don’t think cowboy 2.0 is out yet. From 
Cowboy 2.0 will be released once all the breaking changes are completed and the temporarily removed features are added back.
There are examples on github  on how to use phoenix with cowboy 2.0-pre though.
Ah, I was reading Cowboy 2.0 docs so I thought it had already been released.
It’s released https://github.com/ninenines/cowboy/releases/tag/2.0.0
For those interested in Phoenix support for Cowboy 2.0, you should likely follow this Github thread: https://github.com/elixir-plug/plug/issues/599