chore(package): update @angular/cli to version 9.0.6

Closes #243

Author: greenkeeper[bot]

package.json

@@ -58,7 +58,7 @@
   "devDependencies": {
     "@angular-devkit/build-angular": "~0.803.19",
     "@angular-devkit/build-ng-packagr": "~0.803.19",
-    "@angular/cli": "^8.3.19",
+    "@angular/cli": "^9.0.6",
     "@angular/common": "8.2.14",
     "@angular/compiler": "8.2.14",
     "@angular/compiler-cli": "8.2.14",