Update repo config and support 3.8

[csala]

Update the repository configuration to:

• Support python 3.8
• Upgrade dependencies
• Improve testing setup

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@1e5177a). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #53   +/-   ##
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  Coverage          ?   27.54%           
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  Files             ?       19           
  Lines             ?     1692           
  Branches          ?        0           
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  Hits              ?      466           
  Misses            ?     1226           
  Partials          ?        0           

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