Fix: Support PyJWT 2 and up

[marcgibbons]

The current requirements specify a dependency of pyjwt < 2. This restriction can cause conflicts in projects using PyJWT 2.x either explicitly or as a dependency of another library.

In Python 3 with PyJWT 2.0.1, the token returned is a string type and not bytes, so the .decode('utf-8') was replaced with six.enforce_text to support both strings and bytes.

There is a typo in one of the tests – jwt.decode expects the kwarg alogrithms, not algorithm. This silently passes in PyJWT < 2, but is a requirement in later versions.

Finally, I unpinned the dev requirement versions as the specified version of pylint errors in the 3.6 environment.

🚀

[codecov-io]

Codecov Report

Merging #27 (0cdbedd) into master (41300ee) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #27   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          483       484    +1     
=========================================
+ Hits           483       484    +1     

Impacted Files	Coverage Δ
tests/test_users.py	100.00% <ø> (ø)
pusher_push_notifications/__init__.py	100.00% <100.00%> (ø)

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[jonathanlloyd]

Thanks for the contribution!
I'll get this released asap 😄

[marcgibbons]

@jonathanlloyd thank you!