Add padding checkmark

.github/PULL_REQUEST_TEMPLATE.md

-Thank you for taking the time to work on a PR for this project!
+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 additions are ordered alphabetically.
+- [ ] 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.