Review: Remove last checklist item for core team

Author: paulinea

.github/PULL_REQUEST_TEMPLATE.md

@@ -27,5 +27,4 @@ Closes #
 - [ ] Documentation has been updated if relevant
 - [ ] Design review
 - [ ] A11y review
-- [ ] Internal files have been updated if relevant (THIRD_PARTY, NOTICE)
-- [ ] changelog.md has been updated respecting [keep a changelog rules](https://keepachangelog.com/en/1.0.0/) and referencing the issue
+- [ ] Internal files have been updated if relevant (THIRD_PARTY, NOTICE)