Fix missing unsubscribe

Author: davidwalschots

angular-reactive-validation/package.json

@@ -1,7 +1,7 @@
 {
   "name": "angular-reactive-validation",
   "description": "Reactive Forms validation shouldn't require the developer to write lots of HTML to show validation messages. This library makes it easy.",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "repository": {
     "type": "git",
     "url": "https://github.com/davidwalschots/angular-reactive-validation.git"

angular-reactive-validation/src/validation-messages/validation-messages.component.ts

@@ -77,7 +77,7 @@ export class ValidationMessagesComponent implements AfterContentInit, OnDestroy,
   }
 
   ngAfterContentInit() {
-    this.messageComponents.changes.subscribe(this.validateChildren);
+    this.messageComponentsChangesSubscription.add(this.messageComponents.changes.subscribe(this.validateChildren));
     this.validateChildren();
 
     this._for.forEach(control => {