changelog: adds note about closing #9367

CHANGELOG.md

@@ -21,6 +21,7 @@
 ## Minor
 * **SMTP**: Make it possible to set specific EHLO for smtp client. [#9319](https://github.com/grafana/grafana/issues/9319)
 * **Dataproxy**: Allow grafan to renegotiate tls connection [#9250](https://github.com/grafana/grafana/issues/9250)
+* **HTTP**: set net.Dialer.DualStack to true for all http clients [#9367](https://github.com/grafana/grafana/pull/9367)
 
 # 4.5.2 (2017-09-22)