Add VSTS to search keyword list

[chrisdias]

This adds "VSTS" to the list of keywords in package.json.

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[jeffyoung]

Hi Chris. Thanks for the pull request.

A while back I actually had to reduce the number of keywords in the package.json file to 5 due to this change in the vsce tool. I'm not sure why the change was necessary but there it is. :-)

If you would, I'd appreciate it if you could replace the "ALM" and "Git" keywords with "VSTS" and "Team Foundation Server" (re-alphabetize, if you would). The latter keyword I accidentally neglected to add/change before the 103 release. I'd be happy to merge that PR.