chore(package): update @angular-devkit/schematics to version 9.0.7

Closes #20

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "@angular/router": "^7.2.15"
   },
   "devDependencies": {
-    "@angular-devkit/schematics": "^7.3.9",
+    "@angular-devkit/schematics": "^9.0.7",
     "@angular/animations": "^7.2.15",
     "@angular/compiler": "^7.2.15",
     "@angular/compiler-cli": "^7.2.15",