Aplpy

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- Updated package infrastructure to follow guidelines described in APE 17, namely
removing astropy-helpers and using tox for setting up testing environments. [448]

- Fix compatibility with astropy 4.x and 5.0. [448,471]

- Fixed default color for ``show_lines`` (was previously transparent, now black). [441]

- Fixed ``set_tick_direction`` to not error due to incorrect reference to ``ax``. [450]

- Fixed compatibility with Matplotlib 3.4. [466]

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- Fix 'arcsinh' stretch and fix definition of vmid to match that in 1.x. [421]

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- Fixed ``set_nan_color``. [419]

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- Remove unused arguments in ``make_rgb_cube`` and fix behavior of
``north=False``. [417]

- Fixed bug in image extent for non-square RGB images. [417]

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- Refactored APLpy to make use of WCSAxes to draw coordinate frames and
astropy.visualization to deal with image stretching. [239, 364, 365]

- Use reproject package instead of montage-wrapper and Montage. [360]

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- Added missing LICENSE and README to tarball.

- Fix undefined ``HDUList``. [317]