updated pull request template

Author: Fontanapink

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,5 +1,11 @@
-## Pull Request Checklist
-- [ ] I have read the [CONTRIBUTING](../CONTRIBUTING.md) doc
-- [ ] My code follows the code style of this project
+## I have done the following to make this PR ready for review:
+- [ ] I have updated the `requirements.txt` file (if appropriate)
+- [ ] I have re-based my branch on the latest master branch
 - [ ] I have added necessary documentation (if appropriate)
 - [ ] I have **commented my code**, particularly in hard-to-understand areas
+
+## For the reviewer, make sure this PR meets these criteria before merging:
+- [ ] New code has comments
+- [ ] New code has tests (if appropriate)
+- [ ] New code has documentation (if appropriate)
+- [ ] New code has been reviewed by at least one other person