rearrange bullet points in PR template

[skip ci]

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,5 +1,5 @@
-* Rebase your PR if it gets out of sync with master
 * Follow the contribution guidelines in [`CONTRIBUTING.md`](https://github.com/grafana/grafana/blob/master/CONTRIBUTING.md)
+* Rebase your PR if it gets out of sync with master
 * Include `closes #<issue>` or a link to the issue in the description
 
 **REMOVE THE TEXT ABOVE BEFORE CREATING THE PULL REQUEST**