Issue Summary

The title speaks for itself. I think we should migrate to PyJWT 2.0 to comply with being updated all the time.
It is noticeable that the community moves towards dropping Python 2.7 support as it stopped being maintained and is considered deprecated. Upgrading to PyJWT 2.0 will force us to drop Python 2.7 support and I think we should drop it regardless of updating PyJWT.

WDYT?