[gemspec] Update Xcodeproj dependency.
[gemspec] Update Xcodeproj dependency.

vivekshukla-mob-ibtech/Repository,0xced/CocoaPods,orta/CocoaPods,ashfurrow/CocoaPods,Ashton-W/CocoaPods,mglidden/CocoaPods,mglidden/CocoaPods,mglidden/CocoaPods,segiddins/CocoaPods