Update user count in README.md

Updated user count from 1,300 to 1,500 in project description.

Author: whelanh

README.md

@@ -4,7 +4,7 @@
 <img width="256" height="256" alt="io github whelanh scidCommunity" src="https://github.com/user-attachments/assets/26277294-00cb-4660-964d-f88f4364e9c8" />
 </p>
 
-**scidCommunity** is a powerful chess analysis and database program. Originally derived from `Scid` (Shane's Chess Information Database), it has evolved into a distinct tool with numerous enhancements and a growing community of over 1,300 users.
+**scidCommunity** is a powerful chess analysis and database program. Originally derived from `Scid` (Shane's Chess Information Database), it has evolved into a distinct tool with numerous enhancements and a growing community of over 1,500 users.
 
 While it maintains compatibility with the original Scid database formats, **scidCommunity** focuses on modern features like integrations with Lichess and Chess.com, user-requested improvements, and a streamlined experience for analysis and database management. **scidCommunity** is free software and is released under the GPL licence.