[libcoppp] Update version to 1.3.0#12264

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ras0219-msft merged 2 commits intomicrosoft:masterfrom

owent-contrib:master

Jul 7, 2020

Commits on Jul 6, 2020

Update libcoppp
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Commits on Jul 7, 2020

Merge patch from https://github.com/microsoft/vcpkg/pull/12264
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