update change log

Author: sfc-gh-mpenumathsa

DESCRIPTION.md

@@ -10,6 +10,7 @@ Source code is also available at: https://github.com/snowflakedb/snowflake-conne
 - v4.2.0(TBD)
   - Added support for async I/O. Asynchronous version of connector is available via `snowflake.connector.aio` module.
   - Added `SnowflakeCursor.stats` property to expose granular DML statistics (rows inserted, deleted, updated, and duplicates) for operations like CTAS where `rowcount` is insufficient.
+  - Added support for injecting SPCS service identifier token (`SPCS_TOKEN`) into login requests when present in SPCS containers.
 
 - v4.1.1(TBD)
   - Relaxed pandas dependency requirements for Python below 3.12.