Add changes to changelog

CHANGELOG.md

@@ -13,6 +13,7 @@ We use *breaking* word for marking changes that are not backward compatible (rel
 
 ### Added
 
+- [#1378](https://github.com/thanos-io/thanos/pull/1378) Thanos Receive now exposes `thanos_receive_config_hash`, `thanos_receive_config_last_reload_successful` and `thanos_receive_config_last_reload_success_timestamp_seconds` metrics to track latest configuration change
 - [#1358](https://github.com/thanos-io/thanos/pull/1358) Added `part_size` configuration option for HTTP multipart requests minimum part size for S3 storage type
 - [#1363](https://github.com/thanos-io/thanos/pull/1363) Thanos Receive now exposes `thanos_receive_hashring_nodes` and `thanos_receive_hashring_tenants` metrics to monitor status of hash-rings
 
@@ -32,6 +33,10 @@ We use *breaking* word for marking changes that are not backward compatible (rel
 - [#1327](https://github.com/thanos-io/thanos/pull/1327) `/series` API end-point now properly returns an empty array just like Prometheus if there are no results
 - [#1302](https://github.com/thanos-io/thanos/pull/1302) Thanos now efficiently reuses HTTP keep-alive connections
 
+### Deprecated
+
+- [#xxx](https://github.com/thanos-io/thanos/pull/xxx) Thanos Query and Receive now uses common instrumentation middleware. As as result, for sake of `http_requests_total` and `http_request_duration_seconds_bucket`; Thanos Query no longer exposes `thanos_query_api_instant_query_duration_seconds`, `thanos_query_api_range_query_duration_second` metrics and Thanos Receive no longer exposes `thanos_http_request_duration_seconds`, `thanos_http_requests_total`, `thanos_http_response_size_bytes`.
+
 ## [v0.6.0](https://github.com/thanos-io/thanos/releases/tag/v0.6.0) - 2019.07.18
 
 ### Added