simplify PR template.

Author: diasbruno

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,15 +1,5 @@
-Fixes #[issue number].
-
-Changes proposed:
-
--
--
-
-Upgrade Path (for changed or removed APIs):
-
-
 Acceptance Checklist:
-- [ ] The commit message follows the guidelines in `CONTRIBUTING.md`.
-- [ ] Documentation (README.md) and examples have been updated as needed.
-- [ ] If this is a code change, a spec testing the functionality has been added.
-- [ ] If the commit message has [changed] or [removed], there is an upgrade path above.
+- [ ] Tests
+- [ ] Documentation and examples (if needed)
+
+Fixes #[issue number].