Update company and developer count in README

Author: wenbinf

README.md

@@ -95,7 +95,7 @@ Now you can access the web app at `http://localhost:5173`
 * [General FAQ](https://www.listennotes.com/api/faq/)
 * [How to evaluate a 3rd party RESTful API?](https://www.listennotes.com/blog/how-to-evaluate-a-3rd-party-restful-api-47/)
 
-What have 9,000+ companies & developers built with Listen Notes Podcast API:
+What have 12,000+ companies & developers built with Listen Notes Podcast API:
 
 *   [E-Learning Platforms](https://www.listennotes.com/use-cases/elearning-platforms/)
 *   [Podcast Clipping Apps](https://www.listennotes.com/use-cases/podcast-clipping-apps/)