Update readme.
Update readme.

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