Require hub package
Require hub package

Provide some features to interact with github repository
Reduce complixity with some call API

As ubuntu package are not available and snap is not recommended we use nix version
homebrew is not installable on xenial travis context

References :
* https://hub.github.com/
* https://docs.travis-ci.com/user/installing-dependencies/#installing-projects-from-source
* https://docs.brew.sh/Homebrew-on-Linux

AlternC/alternc-certbot,AlternC/alternc-certbot