Use Travis CI for Windows Tests instead of AppVeyor on the 3.x-stable branch

[xalopp]

Type of PR

• [ ] Bugfix
• [ ] New Feature
• [X ] Other (explain):

Breaking changes

• [ ] Yes, this is a breaking change

Description

Use Travis CI for Windows Tests instead of AppVeyor for the Stable 3.x branch

[codecov[bot]]

Codecov Report

Merging #142 into 3.x-stable will not change coverage. The diff coverage is n/a.

@@             Coverage Diff             @@
##             3.x-stable   #142   +/-   ##
===========================================
  Coverage           100%   100%           
  Complexity          133    133           
===========================================
  Files                 6      6           
  Lines               556    556           
===========================================
  Hits                556    556

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[mmoll]

merged, merci @xalopp!