* Fix XcodeGen building after XcodeProj update to 8.8.0
**Reason**
- XcodeProj has been updated and has API breaking changes
**Content**
- Added new enum case handling in `Linkage`
- Renamed the enum case name for `XCWorkspaceDataFileRef.init`
* add new product type to docs
* update changelog
Co-authored-by: Yonas Kolb <yonaskolb@users.noreply.github.com>