chore(package): update @angular/cli to version 9.0.7

Closes #11

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
     "bootstrap": "4.0.0"
   },
   "devDependencies": {
-    "@angular/cli": "~1.7.1",
+    "@angular/cli": "~9.0.7",
     "@angular/compiler-cli": "^5.2.0",
     "@angular/language-service": "^5.2.0",
     "@types/jasmine": "~2.8.3",