add changelog

Signed-off-by: Ashwanth Goli <iamashwanth@gmail.com>

Author: ashwanthgoli

CHANGELOG.md

@@ -51,6 +51,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 - [#116](https://github.com/thanos-io/objstore/pull/116) Azure: Add new storage_create_container configuration property
 - [#128](https://github.com/thanos-io/objstore/pull/128) GCS: Add support for `ChunkSize` for writer.
 - [#130](https://github.com/thanos-io/objstore/pull/130) feat: Decouple creating bucket metrics from instrumenting the bucket
+- [#147](https://github.com/thanos-io/objstore/pull/147) gcs: Add config to disable retries.
 
 ### Changed
 - [#38](https://github.com/thanos-io/objstore/pull/38) *: Upgrade minio-go version to `v7.0.45`.