Update PULL_REQUEST_TEMPLATE [skip ci] (#6000)
Update PULL_REQUEST_TEMPLATE [skip ci] (#6000)

Co-authored-by: mergify[bot] <b09a6ee808b67e98a221404e7aaa52e0398a4954@users.noreply.github.com>
williamFalcon/pytorch-lightning,williamFalcon/pytorch-lightning