docs(changelog): add html encoding for table panel

CHANGELOG.md

@@ -18,6 +18,7 @@
 * **snapshot**: Annotations are now included in snapshots, closes [#3635](https://github.com/grafana/grafana/issues/3635)
 * **Admin**: Admin can now have global overview of Grafana setup, closes [#3812](https://github.com/grafana/grafana/issues/3812)
 * **graph**: Right side legend height is now fixed at row height, closes [#1277](https://github.com/grafana/grafana/issues/1277)
+* **Table**: All content in table panel is now html escaped, closes [#3673](https://github.com/grafana/grafana/issues/3673)
 
 ### Bug fixes
 * **Playlist**: Fix for memory leak when running a playlist, closes [#3794](https://github.com/grafana/grafana/pull/3794)