appveyor.yml Attempt to fix test failure reporting #659
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A followup to #655.
PowerShell script in testing does not fail build, see https://ci.appveyor.com/project/jdavid/pygit2/branch/master/job/ra1y9vjcva0exm6m and explanation at http://help.appveyor.com/discussions/problems/4498-powershell-exception-in-test_script-does-not-fail-build