v2.2.1

[v2.2.1]

• Fix a cold dynamic-mode startup stalling on bundles with a big history.
• Fix antidote update intermittently failing with fatal: Cannot rebase onto multiple branches right after a fresh clone (#273). Git appends to FETCH_HEAD without locking it, so the background deepen started by a clone could corrupt what git pull read on the same repo. Update now rebases onto the remote-tracking ref instead of FETCH_HEAD.
• Fix antidote update failing on a bundle whose shallow clone is grafted so git cannot see its commit as an ancestor of upstream. The rebase replayed commits that were already upstream and conflicted; update now takes upstream as-is for that case, keeping local changes that no longer apply in the stash rather than writing conflict markers into a plugin file.
• Fix antidote update printing no commit list under the updated: line whenever the old commit had no parent in the clone, which is any shallow bundle and any repo updated from its root commit. The list also no longer repeats the commit you were already on.
• Fix antidote commands failing with function definition file not found after a package manager upgrade (#271). Setup resolved its own install path through symlinks, so a Homebrew shell recorded the versioned keg directory instead of the stable share/antidote link. Upgrading deleted that keg out from under every running shell, breaking any function not yet autoloaded.