Trying out the new pull request template

.github/PULL_REQUEST_TEMPLATE.md

+Thanks for making a pull request to converse.js!
+
+Before submitting your request, please make sure the following conditions are met:
+
+- [ ] Add a changelog entry for your change in `docs/CHANGES.md`
+- [ ] When adding a configuration variable, please make sure to
+      document it in `docs/source/configuration.rst`
+- [ ] Please add a test for your change. Tests can be run in the commandline
+      with `make check` or you can run them in the browser by running `make serve`
+      and then opening `http://localhost:8000/tests.html`.