chore(package): update @angular-devkit/build-angular to version 0.900.4

Closes #149

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "zone.js": "~0.8.26"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "~0.13.0",
+    "@angular-devkit/build-angular": "~0.900.4",
     "@angular/cli": "~7.3.7",
     "@angular/compiler-cli": "~7.2.0",
     "@angular/language-service": "~7.2.0",