updated PR template

Author: wknoben

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,8 +1,8 @@
 Make sure all the relevant boxes are checked (and only check the box if you actually completed the step):
 
-- [ ] closes #xxx (identify the issue associated with this PR)
-- [ ] tests passed
-- [ ] new tests added
-- [ ] science test figures
-- [ ] checked that the new code conforms to the [SUMMA coding conventions](https://github.com/NCAR/summa/blob/master/docs/howto/summa_coding_conventions.md)
-- [ ] ReleaseNotes entry
+- [ ] Closes #xxx (identify the issue associated with this PR)
+- [ ] Code passes standard test cases (results are either bit-for-bit identical, or differences are explained in the PR comment)
+- [ ] New tests added (describe which tests were performed to test the changes)
+- [ ] Science test figures (add figures to PR comment and describe the tests)
+- [ ] Checked that the new code conforms to the [SUMMA coding conventions](https://github.com/NCAR/summa/blob/master/docs/howto/summa_coding_conventions.md)
+- [ ] Describe the change in the release notes (found here: `./summa/docs/whats-new.md`)