refactor: 🧑‍💻 simplify the pull request template (#165)

# Description

Since our tests fail if coverage is below 90%, including a checklist
item adding about tests isn't necessary.

This PR needs a quick review.

## Checklist

- [x] Ran `just run-all`

Author: lwjohnst86

.github/pull_request_template.md

@@ -1,13 +1,12 @@
 # Description
 
-This PR DESCRIBE CHANGES.
+These changes EXPLANATION.
 
 Closes #
 
 This PR needs a quick/an in-depth review.
 
 ## Checklist
 
-- [ ] Added or updated tests
-- [ ] Updated documentation
 - [ ] Ran `just run-all`
+- [ ] Formatted Markdown, if modified

template/.github/pull_request_template.md

@@ -1,13 +1,12 @@
 # Description
 
-This PR DESCRIBE CHANGES.
+These changes EXPLANATION.
 
 Closes #
 
 This PR needs a quick/an in-depth review.
 
 ## Checklist
 
-- [ ] Added or updated tests
-- [ ] Updated documentation
 - [ ] Ran `just run-all`
+- [ ] Formatted Markdown, if modified