Enables CI and drops support for Ruby < 2.4 #112
Merged
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Since Circle CI was broken, I decided to enable Github Action.
I had some problems with Ruby and Bundler version. Ubuntu 18.04 hasn't some old Ruby images and these old Ruby images ask for newer Bundler. To avoid this problems and keep things updated, I dropped some Ruby versions.
Soon Ubuntu 20.04 will be the default image, so we should fix it on 18.04 in the future or just drop another Ruby supports.