Update ChangeLog

Author: kar-rahul-aws

CHANGELOG.md

@@ -2,6 +2,7 @@
  - [#20](https://github.com/aws/aws-iot-core-mqtt-file-streams-embedded-c/pull/20) Move base64 decode table out of function to reduce function complexity.
  - [#22](https://github.com/aws/aws-iot-core-mqtt-file-streams-embedded-c/pull/22) Fix MISRA C 2012 violations.
  - [#23](https://github.com/aws/aws-iot-core-mqtt-file-streams-embedded-c/pull/23) Update API to return the fileID, blockID and blockSize.
+ - [#32](https://github.com/aws/aws-iot-core-mqtt-file-streams-embedded-c/pull/32) Make block size for file transfer configurable from 256 bytes to 128 KiloBytes.
 
 ## v1.0.0 (November 2023)