fix(package): update @angular-devkit/schematics to version 8.1.2

Closes #115

Author: greenkeeper[bot]

package.json

@@ -92,7 +92,7 @@
     "@angular-devkit/architect": "0.13.9",
     "@angular-devkit/build-angular": "0.13.9",
     "@angular-devkit/core": "7.3.9",
-    "@angular-devkit/schematics": "7.3.9",
+    "@angular-devkit/schematics": "8.1.2",
     "@nestjs/common": "6.1.1",
     "@nestjs/core": "6.1.1",
     "@nestjs/passport": "6.0.0",