Astropy-helpers

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- Nothing changed.

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- Nothing changed.

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- Removing Python 2 support, including 2to3. Packages wishing to keep Python
2 support should NOT update to this version. [340]

- Removing deprecated _test_compat making astropy a hard dependency for
packages wishing to use the astropy tests machinery. [314]

- Removing unused 'register' command since packages should be uploaded
with twine and get registered automatically. [332]

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- Fixed an issue that caused pytest to crash if it tried to collect
tests. [488]

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- Removed ``tocdepthfix`` sphinx extension that worked around a big in
Sphinx that has been long fixed. [475]

- Allow Python dev versions to pass the python version check. [476]

- Updated bundled version of sphinx-automodapi to v0.11. [478]

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- Updated bundled version of sphinx-automodapi to v0.10. [439]

- Updated bundled sphinx extensions version to sphinx-astropy v1.1.1. [454]

- Include package name in error message for Python version in
``ah_bootstrap.py``. [441]