Fix bb bot pr template

Closes GH-59.

Reviewed-by: Titus Wormer <tituswormer@gmail.com>

.github/pull-request-template.md

@@ -11,3 +11,25 @@ P.S. have you seen our support and contributing docs?
 https://mdxjs.com/community/support/
 https://mdxjs.com/community/contribute/
 -->
+
+<!--
+  Please check the needed checkboxes ([ ] -> [x]). Leave the
+  comments as they are, they won’t show on GitHub.
+  We are excited about pull requests, but please try to limit the scope, provide
+  a general description of the changes, and remember, it’s up to you to convince
+  us to land it.
+-->
+
+### Initial checklist
+
+*   [ ] I read the support docs <!-- https://github.com/unifiedjs/.github/blob/main/support.md -->
+*   [ ] I read the contributing guide <!-- https://github.com/unifiedjs/.github/blob/main/contributing.md -->
+*   [ ] I agree to follow the code of conduct <!-- https://github.com/unifiedjs/.github/blob/main/code-of-conduct.md -->
+*   [ ] I searched issues and couldn’t find anything (or linked relevant results below) <!-- https://github.com/search?q=user%3Aunifiedjs&type=Issues -->
+*   [ ] If applicable, I’ve added docs and tests
+
+### Description of changes
+
+TODO
+
+<!--do not edit: pr-->