update to latest 8.x version

package.json

@@ -35,9 +35,9 @@
     "zone.js": "~0.9.1"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "~0.803.24",
-    "@angular-devkit/build-ng-packagr": "~0.803.24",
-    "@angular/cli": "~8.3.24",
+    "@angular-devkit/build-angular": "~0.803.28",
+    "@angular-devkit/build-ng-packagr": "~0.803.28",
+    "@angular/cli": "~8.3.28",
     "@angular/compiler-cli": "~8.2.14",
     "@angular/language-service": "~8.2.14",
     "@types/jasmine": "~3.3.7",