add changelog

Signed-off-by: Augustin Husson <[email protected]>

CHANGELOG.md

@@ -12,7 +12,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 
 ### Added
 
-- [#4384](https://github.com/thanos-io/thanos/pull/4384) Fix the experimental PromQL editor when used on multiple line.
+- [#4403](https://github.com/thanos-io/thanos/pull/4403) Add sorting and filtering to flags page
 - [#4299](https://github.com/thanos-io/thanos/pull/4299) Tracing: Add tracing to exemplar APIs.
 - [#4327](https://github.com/thanos-io/thanos/pull/4327) Add environment variable substitution to all YAML configuration flags.
 - [#4239](https://github.com/thanos-io/thanos/pull/4239) Add penalty based deduplication mode for compactor.
@@ -21,6 +21,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 
 ### Fixed
 
+- [#4384](https://github.com/thanos-io/thanos/pull/4384) Fix the experimental PromQL editor when used on multiple line.
 - [#4342](https://github.com/thanos-io/thanos/pull/4342) ThanosSidecarUnhealthy doesn't fire if the sidecar is never healthy
 - [#4388](https://github.com/thanos-io/thanos/pull/4388) Receive: fix bug in forwarding remote-write requests within the hashring via gRPC when TLS is enabled on the HTTP server but not on the gRPC server.