Update importlib-metadata to 3.0.0

[pyup-bot]

This PR updates importlib-metadata from 1.7.0 to 3.0.0.

Changelog

3.0.0

======

* Require Python 3.6 or later.

2.0.0

======

* ``importlib_metadata`` no longer presents a
``__version__`` attribute. Consumers wishing to
resolve the version of the package should query it
directly with
``importlib_metadata.version('importlib-metadata')``.
Closes 71.

Links

• PyPI: https://pypi.org/project/importlib-metadata
• Changelog: https://pyup.io/changelogs/importlib-metadata/
• Docs: http://importlib-metadata.readthedocs.io/

[codecov-io]

Codecov Report

Merging #32 (62e1fa2) into master (4a4a665) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #32   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines          116       116           
=========================================
  Hits           116       116           

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[pyup-bot]

Closing this in favor of #33