allow Python-3.9

[stonebig]

No description provided.

[codecov-commenter]

Codecov Report

Merging #26 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #26   +/-   ##
=======================================
  Coverage   97.72%   97.72%           
=======================================
  Files           7        7           
  Lines         308      308           
=======================================
  Hits          301      301           
  Misses          7        7           

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[AlbertDeFusco]

Hi @stonebig , thanks for this but I won't be able to test whether it works with 3.9 until the Anaconda or conda-forge teams build Python 3.9 packages. I may test this with pip only, but my automated tests are all written with conda. I'll leave this open for now.