Update libPhoneNumber-iOS.podspec [MAINTAINER MUST CREATE GIT TAG] 

include dozens of recent commits (since tag 0.7.2) in the podspec for Cocoapods users

ACTION TO MAINTAINER: you must also create and push a git tag @ 0.7.3 (ideally at current master branch), or whatever version you choose that aligns with the updated .podspec

this is also assuming there are no breaking changes in the diff between master and tag 0.7.2