Adjusted the pull request template

.github/pull_request_template.md

@@ -24,10 +24,7 @@ If there are no entries after the last release, use `**UNRELEASED**` as the vers
 If, say, your patch fixes issue #123, the entry should look like this:
 
 `* Fix big bad boo-boo in task groups (#123
-<https://github.com/agronholm/anyio/issues/123>_; PR by Yourname)`
+<https://github.com/agronholm/anyio/issues/123>_; PR by @yourgithubaccount)`
 
 If there's no issue linked, just link to your pull request instead by updating the
 changelog after you've created the PR.
-
-If possible, use your real name in the changelog entry. If not, use your GitHub
-username.