changelog: add notes about closing #12362

[skip ci]

CHANGELOG.md

@@ -8,6 +8,7 @@
 * **Api**: Delete nonexistent datasource should return 404 [#12313](https://github.com/grafana/grafana/issues/12313), thx [@AustinWinstanley](https://github.com/AustinWinstanley)
 * **Dashboard**: Fix selecting current dashboard from search should not reload dashboard [#12248](https://github.com/grafana/grafana/issues/12248)
 * **Singlestat**: Make colorization of prefix and postfix optional in singlestat [#11892](https://github.com/grafana/grafana/pull/11892), thx [@ApsOps](https://github.com/ApsOps)
+* **Table**: Make table sorting stable when null values exist [#12362](https://github.com/grafana/grafana/pull/12362), thx [@bz2](https://github.com/bz2)
 
 # 5.2.1 (2018-06-29)