chore(package): update @angular/cli to version 8.3.9

Closes #47

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
   },
   "devDependencies": {
     "@angular-devkit/build-angular": "^0.13.1",
-    "@angular/cli": "^7.1.4",
+    "@angular/cli": "^8.3.9",
     "@angular/compiler-cli": "^7.1.4",
     "@angular/language-service": "^7.1.4",
     "@types/jasmine": "^3.3.12",