I added centos-8 docker image:

And centos-8 build in Travis:

After fixing 22 tests trying to run /usr/bin/python2, we have

only 3 failing tests in lib-py36:

lib/hooks_test.py .....................x......F..............            [ 50%]
ssl_test.py ...........FF...                                             [100%]

Marcin already handled the ssl tests in:

I'm not sue why the hook test fail.

Please review:

Nir