Update README to include SQL Server support

Author: benitav

README.md

@@ -2,7 +2,7 @@
   <a href="https://www.powersync.com" target="_blank"><img src="https://github.com/powersync-ja/.github/assets/7372448/d2538c43-c1a0-4c47-9a76-41462dba484f"/></a>
 </p>
 
-_[PowerSync](https://www.powersync.com) is a sync engine for building local-first apps with instantly-responsive UI/UX and simplified state transfer. Syncs between SQLite on the client-side and Postgres, MongoDB or MySQL on the server-side._
+_[PowerSync](https://www.powersync.com) is a sync engine for building local-first apps with instantly-responsive UI/UX and simplified state transfer. Syncs between SQLite on the client-side and Postgres, MongoDB, MySQL or SQL Server on the server-side._
 
 # PowerSync JavaScript SDKs