chore: improve PR template

Author: ldez

.github/PULL_REQUEST_TEMPLATE.md

@@ -5,7 +5,8 @@ WARNING:
 We use Dependabot to update dependencies (linters included).
 The updates happen at least automatically once a week (Sunday 11am UTC).
 
-No pull requests to update a linter will be accepted unless you are the author of the linter AND specific changes are required.
+No pull requests to update a linter will be accepted unless:
+you are the original author of the linter, AND there are important changes required (like a major version bump).
 
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