Jaraco.xkcd

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No significant changes.

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Switch to PEP 420 for namespace packages.

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Better test coverage. Removed ``Comic.older()``.

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Require Python 3.6 or later.

Requests are now cached in ~/.cache/xkcd. Location can be overridden
with ``XKCD_CACHE_DIR``.

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Drop support for Python 3.5.

Switch to `pkgutil namespace technique
<https://packaging.python.org/guides/packaging-namespace-packages/#pkgutil-style-namespace-packages>`_
for the ``jaraco`` namespace.

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Comic searches now search the full text of the comics.