v3.39.0

• added: machete.traverse.whenBranchNotCheckedOutInAnyWorktree git config key to control the behavior
  when checking out a branch that is not checked out in any worktree (suggested by @a-harhar)
• changed: github update-pr-descriptions --related, gitlab update-mr-descriptions --related,
  and all subcommands with -U/--update-related-descriptions flag now always update the entire stack (both upstream and downstream PRs/MRs);
  the description style still respects the machete.github.prDescriptionIntroStyle or machete.gitlab.mrDescriptionIntroStyle config setting
• fixed: go first, go last, go root no longer fail when run in detached HEAD state; instead, a sensible default is selected
• fixed: go (interactive mode) no longer fails when run in detached HEAD state; the interface is shown as usual
• improved: advance now only suggests push when the branch is ahead of remote;
  for other sync-to-remote statuses (behind, diverged, in sync, untracked), a warning is displayed instead
• improved: every time a branch is checked out, a Checking out <branch>... OK message is printed out for consistency