Rename PULL_REQUEST_TEMPLATE to PULL_REQUEST_TEMPLATE.md.

.github/PULL_REQUEST_TEMPLATE → .github/PULL_REQUEST_TEMPLATE.md

-## Contributor guidelines
+## Pull Request Guidelines
 
 1. Please read our [contributor guidelines](https://github.com/kubernetes/kubernetes/blob/master/CONTRIBUTING.md).
 1. See our [developer guide](https://github.com/kubernetes/kubernetes/blob/master/docs/devel/development.md).
-1. Follow the instructions for [labeling and writing a release note for this PR](https://github.com/kubernetes/kubernetes/blob/master/docs/devel/pull-requests.md#release-notes) in the block below. (_this would also contain updated detail later about this new template_)
+1. Follow the instructions for [labeling and writing a release note for this PR](https://github.com/kubernetes/kubernetes/blob/master/docs/devel/pull-requests.md#release-notes) in the block below.
 
 ```release-note
 * Use the release-note-* labels to set the release note state 
@@ -10,3 +10,6 @@
 -OR-
 * Enter your extended release note here
 ```
+
+
+[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/.github/PULL_REQUEST_TEMPLATE.md?pixel)]()