update plugin.xml for iOS SDK 1.2.2
update plugin.xml for iOS SDK 1.2.2

realpasro09/twilio_client_phonegap,cale148/twilio_client_phonegap,realpasro09/twilio_client_phonegap,peder541/twilio_client_phonegap,cale148/twilio_client_phonegap,realpasro09/twilio_client_phonegap,peder541/twilio_client_phonegap,cale148/twilio_client_phonegap,peder541/twilio_client_phonegap