Fix command again to build prod

Author: Julianhm9612

package.json

@@ -8,7 +8,7 @@
     "build": "ng build",
     "watch": "ng build --watch --configuration development",
     "test": "ng test",
-    "heroku-postbuild": "ng build -configuration=production"
+    "heroku-postbuild": "ng build --configuration=production"
   },
   "private": true,
   "dependencies": {