Add Puppet 7 tests + new versions

[mcgege]

+Debian 10 +Ubuntu 20

[mcgege]

also fixes #267

[codecov-commenter]

Codecov Report

Merging #282 (5e302c7) into master (87003ca) will not change coverage.
The diff coverage is n/a.

❗ Current head 5e302c7 differs from pull request most recent head fee7cbd. Consider uploading reports for the commit fee7cbd to get more accurate results

@@           Coverage Diff           @@
##           master     #282   +/-   ##
=======================================
  Coverage   40.81%   40.81%           
=======================================
  Files           4        4           
  Lines          49       49           
=======================================
  Hits           20       20           
  Misses         29       29           

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