v2.1.0

This one shouldn't break anything for anyone currently using 2.0.0 or include any API changes at all, but #34 changes a pretty fundamental internal pattern for the better. This release should make the Dialyzer users out there much happier 😄

Changelog

• Migrates the library from using a Tesla Middleware to a wrapper, allowing us to provide the correct return values in the typespec. (@mupkoo via #34)
• Migrated CI to GitHub Actions instead of Travis CI (@mrcasals via #33)