Update Kotlin badge version in README

Updated the Kotlin version in the badge from 2.1.0 to 2.1.10. This ensures that the displayed version stays consistent with the latest supported version.

Author: smyrgeorge

README.md

@@ -5,7 +5,7 @@
 ![GitHub License](https://img.shields.io/github/license/smyrgeorge/log4k)
 ![GitHub commit activity](https://img.shields.io/github/commit-activity/w/smyrgeorge/log4k)
 ![GitHub issues](https://img.shields.io/github/issues/smyrgeorge/log4k)
-[![Kotlin](https://img.shields.io/badge/kotlin-2.1.0-blue.svg?logo=kotlin)](http://kotlinlang.org)
+[![Kotlin](https://img.shields.io/badge/kotlin-2.1.10-blue.svg?logo=kotlin)](http://kotlinlang.org)
 
 ![](https://img.shields.io/static/v1?label=&message=Platforms&color=grey)
 ![](https://img.shields.io/static/v1?label=&message=Jvm&color=blue)