[fix] formatting for pr template checklist (#172)

[fix] formatting for pr template checklistTurns out you need '* [ ]' to format a checklist.

## Test Plan

* [x] acceptance tests
* [ ] …

## References
<!-- issues documentation links, etc  -->
* https://help.github.com/en/github/managing-your-work-on-github/about-task-lists

.github/pull_request_template.md

@@ -4,9 +4,9 @@
 
 ## Test Plan
 <!-- detail ways in which this PR has been tested or needs to be tested -->
-[ ] acceptance tests
+* [ ] acceptance tests
 <!-- add more below if you think they are relevant -->
-[ ]
+* [ ] …
 
 ## References
 <!-- issues documentation links, etc  -->