test: skip netcoreapp3.1 and add coverage

[viceice]

• remove netcoreapp3.1 tests (EOL)
• generate code coverage
• update required deps

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@c5d52d9). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head 4ca6898 differs from pull request most recent head 067b431. Consider uploading reports for the commit 067b431 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #24   +/-   ##
=========================================
  Coverage          ?   69.68%           
=========================================
  Files             ?        2           
  Lines             ?     3088           
  Branches          ?        0           
=========================================
  Hits              ?     2152           
  Misses            ?      936           
  Partials          ?        0           

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[zone117x]

Looks great, thank you!

We probably need a unit test that iterates through all available types and calls the lookup functions in order to have decent coverage percentage.

[viceice]

Looks great, thank you!

We probably need a unit test that iterates through all available types and calls the lookup functions in order to have decent coverage percentage.

sounds good, will do so in separate PR