Latest python3.6-alpine has conflicts with basehash

Hi All, 

Latest `python:3.6-alpine` has some conflicts with [basehash](https://github.com/bnlucas/python-basehash/). Any suggestions on this issue?

Example: https://gist.github.com/ar0ne/153e3e1253ebf67cab11185e12dd196e

Note: Only switching to `python:3.6-alpine3.9` works for now.
