Update PULL_REQUEST_TEMPLATE.md (#11323)

* Update PULL_REQUEST_TEMPLATE.md

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update PULL_REQUEST_TEMPLATE.md

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

---------

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -6,4 +6,8 @@ Thank you for submitting a YOLOv5 🚀 Pull Request! We want to make contributin
 - Provide before and after profiling/inference/training results to help us quantify the improvement your PR provides (if applicable).
 
 Please see our ✅ [Contributing Guide](https://github.com/ultralytics/yolov5/blob/master/CONTRIBUTING.md) for more details.
+
+Note that Copilot will summarize this PR below, do not modify the 'copilot:all' line.
 -->
+
+copilot:all