Update README.md

Author: DymytriiDev

README.md

@@ -10,13 +10,16 @@ Place webhooks.js inside Gatsby project root folder, then:
 node webhooks.js
 ```
 ## Auto build (update) Webhook
+By default, the script runs on port 9000 (you can customize it).
+That being said, below are example requests.
+
 For Clean & Build:
 ```
-https://your-gatsby-website.com/clean_gatsby_rebuild/
+https://your-server-address:9000/clean_gatsby_rebuild/
 ```
 For re-Build:
 ```
-https://your-gatsby-website.com/quick_gatsby_rebuild/
+https://your-server-address:9000/quick_gatsby_rebuild/
 ```
 
 Contributions are encouraged!