upgrade Windows SDK version from 10.0.10502.0 to 10.0.10586.0

[ForrestTrepte]

Addresses #7

I am also changing the tag from TargetPlatformVersion to WindowsTargetPlatformVersion. I'm not sure of the difference, but in Visual Studio when I used the "Retarget solution" command it added a WindowsTargetPlatformVersion tag, but that didn't work while there was still an older TargetPlatformVersion tag. Other projects don't seem to use the TargetPlatformVersion tag, so hopefully WindowsTargetPlatformVersion is the correct tag to use. Please let me know if this seems incorrect.

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[ForrestTrepte]

It looks to me as if this is the only line that actually changed. I am committing with Unix-style line endings and checking out with Windows-style CRLF endings. This is the recommended setting from git.

Perhaps this file contained Windows line endings and that is why it shows as every line having changed?

[angelaHillier]

Thanks for the fix, Forrest!