chore(package): update @angular/cli to version 9.1.6

Closes #30

Author: greenkeeper[bot]

demo/package.json

@@ -60,7 +60,7 @@
   },
   "devDependencies": {
     "@angular-devkit/build-angular": "^0.13.7",
-    "@angular/cli": "^7.3.7",
+    "@angular/cli": "^9.1.6",
     "@angular/compiler-cli": "^7.2.11",
     "@angular/language-service": "^7.2.11",
     "@angularclass/hmr": "~2.1.3",