Add changelog

Signed-off-by: Alexander Hellbom <[email protected]>

CHANGELOG.md

@@ -22,6 +22,7 @@ We use *breaking* word for marking changes that are not backward compatible (rel
 - [#2858](https://github.com/thanos-io/thanos/pull/2858) Store: Fix `--store.grpc.series-sample-limit` implementation. The limit is now applied to the sum of all samples fetched across all queried blocks via a single Series call, instead of applying it individually to each block.
 - [#2936](https://github.com/thanos-io/thanos/pull/2936) Compact: Fix ReplicaLabelRemover panic when replicaLabels are not specified.
 - [#2956](https://github.com/thanos-io/thanos/pull/2956) Store: Fix fetching of chunks bigger than 16000 bytes.
+- [#2970](https://github.com/thanos-io/thanos/pull/2970) Store: Upgrade minio-go/v7 to fix slowness when running on EKS.
 
 ### Added