Adding [ngModelOptions]="{standalone: true}" to search input to solve issue with required form tag.

fixes #103

Author: softsimon

package.json

@@ -1,6 +1,6 @@
 {
   "name": "angular-2-dropdown-multiselect",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "description": "Customizable dropdown multiselect in Angular 2 with bootstrap css.",
   "main": "src/multiselect-dropdown.ts",
   "repository": {

src/multiselect-dropdown.ts

@@ -97,7 +97,7 @@ export class MultiSelectSearchFilter implements PipeTransform {
           <div class="input-group input-group-sm">
             <span class="input-group-addon" id="sizing-addon3"><i class="fa fa-search"></i></span>
             <input type="text" class="form-control" placeholder="{{ texts.searchPlaceholder }}"
-                   aria-describedby="sizing-addon3" [(ngModel)]="searchFilterText">
+                   aria-describedby="sizing-addon3" [(ngModel)]="searchFilterText" [ngModelOptions]="{standalone: true}">
             <span class="input-group-btn" *ngIf="searchFilterText.length > 0">
   			    <button class="btn btn-default btn-secondary" type="button" (click)="clearSearch($event)"><i class="fa fa-times"></i></button>
 	          </span>