Jaraco.video

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* Switch to PEP 420 namespace package.

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* Cleanup README.

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* 9: In DexterLib, once again the media type is ``tag_AMMediaType``.
* Require Python 3.6 or later.

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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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* 9: The name was meant to be ``_AMMediaType``.

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* 9: Expect ``AMMediaType`` in DexterLib and not ``tag_AMMediaType``.
Cause for the change is unknown.