Changes since 0.2:
* Accept failures to unset core.worktree in clone (0a155847,
2017-10-10, unreleased).
* Use --no-renames in log (f9189a06, 2016-09-26, v0.24).
* Auto-checkout in clone if it wouldn't clobber (7ef3b653, 2017-10-10,
unreleased).
* Add a 'help' command for folks who don't like --help
(9d25c97d, 2014-10-03, v0.20).
* Setup a 'config' branch on clone to track origin/config (244f8739,
2015-03-22, v0.20). This branch may be consumed by
notmuch-report(1).
* Only error for invalid diff lines in tags/ (57225988, 2017-10-16,
unreleased).
* Ignore # comments in 'notmuch dump ...' output (9bbc54bd,
2016-03-27, v0.22).
* Respect 'expect' in _spawn(..., wait=True) (e263c5b1, 2017-10-10,
unreleased).
* Update URLs in documentation (554b90b5 and 6a833a6e8, 2016-06-02,
v0.23).
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