chore(pull_request_template): remove anoying line break

Author: sebastian-brunner

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,8 +4,7 @@ merging the pull request:
 - [ ] added description what has been changed and why
 - [ ] if appropriate, include changes into the changelog
 - [ ] if appropriate, adapt/extend the documentation
-- [ ] as external contributor, you need to sign the Contributor License Agreement (CLA), which can be found in the 
-root directory of the repository
+- [ ] as external contributor, you need to sign the Contributor License Agreement (CLA), which can be found in the root directory of the repository
 
 For reviewers:
 - [ ] after merging the pull request, check if everything looks like expected (especially the changelog)