Project: titanium
Issue TIMOB-23525: Set Xcode 7.3 as the minimum supported Xcode version
For the release 6.0.0, we want to follow the way to use the previous version that is available before the most recent version. In this case, there will be Xcode 8 available for the Ti-SDK release 6.0.0 so we increase the minimum Xcode version from 7.0 to 7.3.
Story points: 3