message: rollup=never simplifies finding parents
diff: @@ -63,9 +63,9 @@ We need to find out the parent commit in which the PR opened last Monday merged.
  Go to that PR, and find the "bors merged commit $SHA into rust-lang:master at the bottom.
  -Locally, run `git log $SHA --author=bors`, and take the SHA of the first
  -bors-authored merge into master (should be the the first commit). Call that
  -`$BRANCH_POINT`.
  +Locally, run `export BRANCH_POINT=`git rev-parse $SHA^` in the rust-lang/rust
  +checkout. This should be bors-authored merge into master of the PR before the
  +version bump merged.
  Create a new branch on `rust-lang/cargo` for the new beta. Here, `rust-lang` is
  the remote for https://github.com/rust-lang/rust.git. Replace `YY` with the
  