Add appveyor.yml#13

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CromwellEnage wants to merge 3 commits intoboostorg:developfrom

CromwellEnage:appveyor

Commits on Sep 30, 2018

Add appveyor.yml
CromwellEnage
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Commits on Oct 1, 2018

Dummy commit
CromwellEnage
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Commits on Dec 22, 2018

Update appveyor.yml
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