Updating version to 0.8.3 (microsoft#78)

Updating version on NuGet package to 0.8.2

Final Prep for Release (microsoft#66)

* Attempting to not produce a prerelease versioned NuGet package.

* Fixing typo

* Trying to use current branch

* Trying to use current branch

* Fixing typo

* Fixed source branch parameter

* Update UPM to only increment if not a release branch

* Preparing for release of 0.8.1