V1.9.0 (#751)
V1.9.0 (#751)

* fixed bug

* fixed test

* Updated ng2-dropdown and added z-index property

* updated ng-packagr config, bumped version to 1.9.0

Gbuomprisco/ng2-tag-input,Gbuomprisco/ng2-tag-input,Gbuomprisco/ngx-chips,Gbuomprisco/ng2-tag-input,Gbuomprisco/ngx-chips,Gbuomprisco/ngx-chips