Update CHANGELOG.md

- added Prometheus query date alignment

CHANGELOG.md

@@ -5,6 +5,7 @@
 * **Dashboard**: Modified time range and variables are now not saved by default [#10748](https://github.com/grafana/grafana/issues/10748), [#8805](https://github.com/grafana/grafana/issues/8805)
 * **Graph**: Show invisible highest value bucket in histogram [#11498](https://github.com/grafana/grafana/issues/11498)
 * **Dashboard**: Enable "Save As..." if user has edit permission [#11625](https://github.com/grafana/grafana/issues/11625)
+* **Prometheus**: Query dates are now step-aligned [#10434](https://github.com/grafana/grafana/pull/10434)
 * **Prometheus**: Table columns order now changes when rearrange queries [#11690](https://github.com/grafana/grafana/issues/11690), thx [@mtanda](https://github.com/mtanda)
 * **Variables**: Fix variable interpolation when using multiple formatting types [#11800](https://github.com/grafana/grafana/issues/11800), thx [@svenklemm](https://github.com/svenklemm)
 * **Dashboard**: Fix date selector styling for dark/light theme in time picker control [#11616](https://github.com/grafana/grafana/issues/11616)