Importlib-metadata

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* Additional performance optimizations in FastPath now
saves an additional 20% on a typical call.
* Correct for issue where PyOxidizer finder has no
``__module__`` attribute. Closes 110.

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* Through careful optimization, ``distribution()`` is
3-4x faster. Thanks to Antony Lee for the
contribution. Closes 95.

* When searching through ``sys.path``, if any error
occurs attempting to list a path entry, that entry
is skipped, making the system much more lenient
to errors. Closes 94.

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* Improve custom finders documentation. Closes 105.

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* Once again, drop support for Python 3.4. Ref 104.

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* Restored support for Python 3.4 due to improper version
compatibility declarations in the v1.1.0 and v1.1.1
releases. Closes 104.

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* Repaired project metadata to correctly declare the
``python_requires`` directive. Closes 103.