Ec2-metadata

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* Move to use Instance Metadata Service version 2. See the README for a note on
its increased security and porting to lock down the less secure version 1.
Thanks ThrawnCA and antuarc for the initial PR.
(`Issue 150 <https://github.com/adamchainz/ec2-metadata/issues/150>`__)

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* Update Python support to 3.5-3.8, as 3.4 has reached its end of life.
* Converted setuptools metadata to configuration file. This meant removing the
``__version__`` attribute from the package. If you want to inspect the
installed version, use
``importlib.metadata.version("ec2-metadata")``
(`docs <https://docs.python.org/3.8/library/importlib.metadata.html#distribution-versions>`__ /
`backport <https://pypi.org/project/importlib-metadata/>`__).

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* Drop Python 2 support, only Python 3.4+ is supported now.

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* Use timeout of 1 second for requests to the metadata API.

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* Fix doucmentation rendering on PyPI.

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* Add ``interface_id`` to ``NetworkInterface``.