Updated README to use new version of CDN.
Updated README to use new version of CDN.

fmin2958/angular-xml,gregpardo/angular-xml,fmin2958/angular-xml,fmin2958/angular-xml,gregpardo/angular-xml,johngeorgewright/angular-xml,johngeorgewright/angular-xml,johngeorgewright/angular-xml,gregpardo/angular-xml