Go straight to the point

We don't have a CLA but the guidelines should be help enough

.github/pull_request_template.md

@@ -4,5 +4,4 @@ A brief description of your changes.
 
 Closes #<issue>.
 
-- [ ] I have performed a self-review of my changes
 - [ ] I have read and understood the [contributing guidelines](/inaka/elvis_core/blob/main/CONTRIBUTING.md)