message: Auto-detect old version
diff: @@ -3,12 +3,12 @@ set -o errexit -o nounset -o pipefail
  command -v shellcheck > /dev/null && shellcheck "$0"
  function print_usage() {
  - echo "Usage: $0 OLD_VERSION NEW_VERSION"
  + echo "Usage: $0 NEW_VERSION"
  echo ""
  - echo "e.g. $0 0.8.0-alpha1 0.8.0"
  + echo "e.g. $0 0.8.0"
  }
  -if [ "$#" -ne 2 ]; then
  +if [ "$#" -ne 1 ]; then
  print_usage
  exit 1
  fi
  @@ -28,8 +28,9 @@ if [[ -n "$CHANGES_IN_REPO" ]]; then
  exit 3
  fi
  -OLD="$1"
  -NEW="$2"
  +NEW="$1"
  +OLD=$(sed -n -e 's/^version[[:space:]]*=[[:space:]]*"\(.*\)"/\1/p' packages/std/Cargo.toml)
  +echo "Updating old version $OLD to new version $NEW ..."
  FILES_MODIFIED=()
  