Appveyor build does not version vsix correctly

[jpogran]

Instead of bumping the version in package.json so that the resulting vsix is named correctly, gulp bump outputs '3.9.1'. This results in a vsix that still uses the production released version, which makes using a 'nightly' build harder than it should

[GH-307-fix-path-resolution-on-nix-and-mac +0 ~3 -0 !] ~\src\lingua-pupuli\puppet-vscode
07-11 15:07:56 30> node .\node_modules\gulp\bin\gulp.js bump --version '99.99.0-appv.127'
3.9.1