Add item regarding description punctuation

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,10 +2,11 @@ Thank you for taking the time to work on a Pull Request for this project!
 
 To ensure your PR is dealt with swiftly please check the following:
 
-- [ ] Your submissions are formatted according to the guidelines in the [contributing guide](CONTRIBUTING.md).
-- [ ] Your changes are made in the [README](../README.md) file, not the auto-generated JSON. 
-- [ ] Your additions are ordered alphabetically.
-- [ ] Your submission has a useful description.
-- [ ] Each table column should be padded with one space on either side.
-- [ ] You have searched the repository for any relevant issues or PRs.
-- [ ] Any category you are creating has the minimum requirement of 3 items.
+- [ ] Your submissions are formatted according to the guidelines in the [contributing guide](CONTRIBUTING.md)
+- [ ] Your changes are made in the [README](../README.md) file, not the auto-generated JSON 
+- [ ] Your additions are ordered alphabetically
+- [ ] Your submission has a useful description
+- [ ] The description does not end with punctuation
+- [ ] Each table column should be padded with one space on either side
+- [ ] You have searched the repository for any relevant issues or pull requests
+- [ ] Any category you are creating has the minimum requirement of 3 items