Add Swift Package Manager tests to .travis.yml
Add Swift Package Manager tests to .travis.yml

iziz/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS