Upgrade to circuits_gpio?

[fhunleth]

circuits_gpio is an improved version of Elixir/ALE's GPIO support. I'm trying to encourage libraries that use Elixir/ALE to upgrade to Circuits since it's easier for me to support Circuits should any issues arise. There should also be a decent performance improvement - although it might not be noticeable under normal operation.

Thanks!

[mnishiguchi]

@fhunleth
I wrote a simple library lcd_display that uses the latest Elixir Circuits libraries and supports some popular I/O expanders.

At first, I tried to fork this repo, but I had never used Elixir ALE before and it was easier for me to start from scratch with Elixir Circuits libraries that I am familiar with.