Update PULL_REQUEST_TEMPLATE.md
Reorganise it a bit to make it a little clearer
+## About this pull request
+
+Description of the pr
+
## Changes
-- [ ] I checked this pull request runs on `Python 3.6.X`.
+What changes were made?
+
+## Checklist
+
+- [ ] I've checked this pull request runs on `Python 3.6.X`.
- [ ] This fixes something in [Issues](https://github.com/eunwoo1104/discord-py-slash-command/issues).
- Issue:
- [ ] This adds something new.
- [ ] There is/are breaking change(s).
-- [ ] (If required) Document string is updated/added.
-- [ ] This changes anything except python code. (README, docs, etc.)
-
-## About this pull request
\ No newline at end of file
+- [ ] (If required) Relavent documentation has been updated/added.
+- [ ] This is not a code change. (README, docs, etc.)
