Todoman

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* Allow passing a custom configuration file with the ``--config/-c`` option.
* Cached list metadata is now invalidated when it has changed on-disk.
* Support for click < 6.0 has been dropped (it wasn't actually working
perfectly any more anyway). Click 7.x is the only currently supported
version.
* ``click-repl`` is now listed as an optional dependency. It is required for
the ``todo repl`` command.
* Add the ``default_priority`` config setting.
* Drop support for Python 3.4.

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* Fix crashes due to API changes in icalendar 4.0.3.
* Dropped compatibility for icalendar < 4.0.3.

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* Support Python 3.7.
* Support click>=7.0.
* Properly parse RBGA colours.

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* Add ``-r`` option to ``new`` to read description from ``stdin``.
* Add a dedicated zsh completion function.
* Lists matching is now case insensitive, unless there are multiple lists with
colliding names, in which case those will be treated case-sensitive.
* Fix some tests that failed due to test dependency changes.

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* New runtime dependency: ``click-log``.
* Drop support for Python 3.3, which has reached its end of life cycle.
* Add `--raw` flag to `edit`. This allows editing the raw icalendar file, but
**only use this if you really know what you're doing**. There's a big risk of
data loss, and this is considered a developer / expert feature!

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* Deploy new versions to PyPI using ``twine``. Travis doesn't seem to be
working.