Update readme.
Update readme.

benelliott/angular2-select,basvandenberg/angular2-select,benelliott/angular2-select,benelliott/angular2-select,basvandenberg/ng-select,basvandenberg/angular2-select,benelliott/angular2-select,basvandenberg/ng-select,basvandenberg/angular2-select,basvandenberg/ng-select,basvandenberg/ng-select