Update README.md

README.md

@@ -8,9 +8,11 @@ Please see the [MET website](https://dtcenter.org/community-code/model-evaluatio
 Version History
 ===============
 
-v2.1
+v3.0
 ----
 
+Increasing the major version number from 2 to 3 because of the operating system version change from Debian 10 to 12.
+
 * Completes transition to debian base image using Debian 12 (bookworm)
 * Adds Proj library dependency
 * Note that upgrading from Debian 10 to 12 requires that the METplus [runtime environements](https://github.com/dtcenter/METplus/tree/develop/internal/scripts/docker_env) also be upgraded to Debian 12