Add CHANGELOG

Signed-off-by: jojohappy <[email protected]>

CHANGELOG.md

@@ -22,6 +22,18 @@ We use *breaking* word for marking changes that are not backward compatible (rel
 ### Changed
 
 - [#1073](https://github.com/improbable-eng/thanos/pull/1073) Store: index cache for requests. It now calculates the size properly (includes slice header), has anti-deadlock safeguard and reports more metrics.
+- [#1066](https://github.com/improbable-eng/thanos/pull/1066) Upgrade Thanos ui to Prometheus v2.9.1.
+
+  Changes from the upstream:
+  * query:
+    - [ENHANCEMENT] Update moment.js and moment-timezone.js [PR #4679](https://github.com/prometheus/prometheus/pull/4679)
+    - [ENHANCEMENT] Support to query elements by a specific time [PR #4764](https://github.com/prometheus/prometheus/pull/4764)
+    - [ENHANCEMENT] Update to Bootstrap 4.1.3 [PR #5192](https://github.com/prometheus/prometheus/pull/5192)
+    - [BUGFIX] Limit number of merics in prometheus UI [PR #5139](https://github.com/prometheus/prometheus/pull/5139)
+    - [BUGFIX] Web interface Quality of Life improvements [PR #5201](https://github.com/prometheus/prometheus/pull/5201)
+  * rule:
+    - [ENHANCEMENT] Improve rule views by wrapping lines [PR #4702](https://github.com/prometheus/prometheus/pull/4702)
+    - [ENHANCEMENT] Show rule evaluation errors on rules page [PR #4457](https://github.com/prometheus/prometheus/pull/4457)
 
 ## [v0.4.0-rc.0](https://github.com/improbable-eng/thanos/releases/tag/v0.4.0-rc.0) - 2019.04.18