Drop support for python2

[hkupty]

this lib should stop supporting py2. Not a huge thing, but I guess it wouldn't hurt, right?

[SevereOverfl0w]

Why drop it when it works?

[hkupty]

No strong reason since there is no maintenance burden. Personally, I think things should stop supporting Py2 so it can rest in peace and people actually move on to Py3. But again, not a huge thing.