Update README.md 
Update README.md 

I am using this library with cocoapod, but have same issue with:
 - https://github.com/iziz/libPhoneNumber-iOS/issues/11 
 - plist file exists in the bundle path, but exception occurs while unarchiveObject in my emulator. 

My solution is: 
 1. update CocoaPod to the latest
 2. fix Podfile and install again.
opentable/libPhoneNumber-iOS,Urucas/libPhoneNumber-iOS,kylejm/libPhoneNumber-iOS,kylejm/libPhoneNumber-iOS,opentable/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,ManagerOrganization/libPhoneNumber-iOS,sahin/libPhoneNumber-iOS,Urucas/libPhoneNumber-iOS,opentable/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,dmaclach/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,sahin/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,UltravisualApp/libPhoneNumber-iOS,yarneo/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,jam891/libPhoneNumber-iOS,dmaclach/libPhoneNumber-iOS,DeskConnect/libPhoneNumber-iOS,yarneo/libPhoneNumber-iOS,ManagerOrganization/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,dmaclach/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,UltravisualApp/libPhoneNumber-iOS,jam891/libPhoneNumber-iOS,marmelroy/libPhoneNumber-iOS,UltravisualApp/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,marmelroy/libPhoneNumber-iOS,DeskConnect/libPhoneNumber-iOS,dmaclach/libPhoneNumber-iOS,dmaclach/libPhoneNumber-iOS