Add CHANGELOG

Signed-off-by: Filip Petkovski <[email protected]>

Author: fpetkovski

CHANGELOG.md

@@ -36,6 +36,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 - [#51](https://github.com/thanos-io/objstore/pull/51) Azure: Support using connection string authentication.
 - [#76](https://github.com/thanos-io/objstore/pull/76) GCS: Query for object names only in `Iter` to possibly improve performance when listing objects.
 - [#85](https://github.com/thanos-io/objstore/pull/85) S3: Allow checksum algorithm to be configured
+- [#92](https://github.com/thanos-io/objstore/pull/92) GCS: Allow using a gRPC client.
 
 ### Changed
 - [#38](https://github.com/thanos-io/objstore/pull/38) *: Upgrade minio-go version to `v7.0.45`.