bump to 5.13.1, fix for SSL

[erickmartins]

Description

This incorporates the changes from #73 and the SSL fix resulting from that.

Checklist

No changes requiring PEP8/unit test changes.

For reviewers

• Check that the PR title is short, concise, and will make sense 1 year later.
• Check that new functions are imported in corresponding __init__.py.