Add types

[GideonBear]

Hi, thanks for the package! It would be great if type-hints could be added so this package can be used with mypy. Thanks!

[GideonBear]

Since I don't think everyone wants to put assert everywhere, Any will have to be used a lot. But IMO, lots of Any is still better than no type-hints at all.
If you're okay with it, I can try to (partly) add types.

[controversial]

I’d welcome a PR!

[GideonBear]

Hi @controversial, I think adding mypy to CI is a good idea, but how should I do that? I have no experience with Travis CI at all (I don't even see it running), but I can set up pre-commit or GitHub Actions if that's needed. (I'm assuming that's what you use, since there's a .travis.yml file)
Do you have any further preferences for mypy?

[GideonBear]

Also, is python 2 (and python 3.6) support still required? The code could be updated to only support non-EOL versions, and it would mean we could type annotations instead of outdated comments.

[controversial]

I’m more than willing to drop support for EOL versions; I wrote this library a long time ago when Python 2/3.6 was still relevant!

[controversial]

Also, adding mypy to a Github Action is definitely a good idea; when I wrote this library Github Actions didn’t exist so Travis was a much more natural choice, but I wouldn’t choose it again today