deleted unused import

Author: sllethe

src/lib/sticky-header/sticky-header-dir.ts

@@ -13,7 +13,6 @@ import {Observable} from 'rxjs/Observable';
 import {Subscription} from 'rxjs/Subscription';
 import 'rxjs/add/observable/fromEvent';
 import 'rxjs/add/operator/debounceTime';
-import {createElement} from "@angular/core/src/view/element";
 
 
 /**