Update PR template (#125)

.github/pull_request_template.md

@@ -1,7 +1,33 @@
-# Pull Request Checklist
+### Prerequisites
+
+Put an `x` into the box(es) that apply:
+
+- [ ] This pull request fixes a bug.
+- [ ] This pull request adds a feature.
+- [ ] This pull request introduces breaking change.
+
+### Description
+
+Describe what this pull request achieves.
+
+### Issues Resolved
+
+List any existing issues this pull request resolves.
+
+### Checklist
+
+Put an `x` into the box(es) that apply:
+
+#### General
 
 - [ ] Describe what changes are being made
 - [ ] Explain why and how the changes were necessary and implemented respectively
 - [ ] Reference issue with `#<ISSUE_NO>` if applicable
-- [ ] If you have changed any SCSS code, run `make release` to regenerate all CSS files.
+
+#### Resources
+
+- [ ] If you have changed any SCSS code, run `make release` to regenerate all CSS files
+
+#### Contributors
+
 - [ ] Add yourself to `CONTRIBUTORS.md` if you aren't on it already