Dinghy

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Fixed
.....

- Better handling of authorization problems, with error message presented so
that the user can fix them.

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Added
.....

- The command line now accepts a GitHub URL to quickly get a week's digest of
activity from a repo (or issues, pull requests, etc).

- The logging level can now be specified with the ``-v``/``--verbosity``
command-line option.

Fixed
.....

- Dependencies now have minimum pins, fixing `issue 1`_.

.. _issue 1: https://github.com/nedbat/dinghy/issues/1

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Added
.....

- GitHub's ghost user shows up in GraphQL results as an "author" of None.
Properly handle that case.

Fixed
.....

- Fixes to the color of labels.

- Correct handling of HTML in bodies.

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Changed
.......

- More HTML tweaks to indentation and information.

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Changed
.......

- Indentation tweaks to make thread structure clearer.

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Changed
.......

- Pull request reviews are displayed more compactly.