Update PULL_REQUEST_TEMPLATE.md

Author: fdiblen

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,6 +1,6 @@
 # Pull request details
 
-As a contributor I confirm,
+As a contributor I confirm
 - [ ] I read and followed the instructions in [CONTRIBUTING.md](CONTRIBUTING.md)
 - [ ] The developer documentation is up to date with the changes introduced in this Pull Request
 - [ ] Tests are passing