Enhancement: Tweak AppVeyor integration

[localheinz]

This PR

• tweaks the AppVeyor integration a bit

Follows #72.

[codecov]

Codecov Report

Merging #73 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             master    #73   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity       68     68           
=======================================
  Files             7      7           
  Lines           263    263           
=======================================
  Hits            263    263

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