feat(changelog): adds TLS Client auth

CHANGELOG.md

@@ -1,9 +1,10 @@
-# 4.0-stable (unrelased)
+# 4.0-stable (unreleased)
 
 ### Bugfixes
 * **Server-side rendering**: Fixed address used when rendering panel via phantomjs and using non default http_addr config [#6660](https://github.com/grafana/grafana/issues/6660)
 * **Graph panel**: Fixed graph panel tooltip sort order issue [#6648](https://github.com/grafana/grafana/issues/6648)
 * **Unsaved changes**: You now navigate to the intended page after saving in the unsaved changes dialog [#6675](https://github.com/grafana/grafana/issues/6675)
+* **TLS Client Auth**: Support for TLS client authentication for datasource proxies [#2316](https://github.com/grafana/grafana/issues/2316)
 
 # 4.0-beta2 (2016-11-21)