Updated Read me - Added reference to Ionic2
Updated Read me - Added reference to Ionic2

Updated Link title for AngularFire2 with Ionic2
maneesht/angularfire2,angular/angularfire,angular/angularfire,maneesht/angularfire2,angular/angularfire,maneesht/angularfire2,maneesht/angularfire2,angular/angularfire