Add a changelog and push git tags

[jakobbouchard]

I noticed there's no changelog and no git tags. This makes it really hard to know what changed between versions, and if there are breaking changes. Since I have a package that can be used as a middleware, it makes it harder for me to see if I need to make changes to it when updates release.

I would suggest creating a changelog using the Keep a Changelog format. This is what I am using for my own package. Also, by pushing the git tags, it would make it easier to compare the commits between versions.