chore(package): update @angular-devkit/build-angular to version 0.13.1

Closes #49

Author: greenkeeper[bot]

demo/package.json

@@ -55,7 +55,7 @@
     "zone.js": "^0.8.26"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "^0.10.4",
+    "@angular-devkit/build-angular": "^0.13.1",
     "@angular/cli": "^7.0.4",
     "@angular/compiler-cli": "^7.0.2",
     "@angular/language-service": "^7.0.2",