- update to version 3.1.0:
  + New Features
    * `~.dates.ConciseDateFormatter`
    * Secondary x/y Axis support
    * `~.scale.FuncScale` for arbitrary axes scales
    * Legend for scatter
    * Matplotlib no longer requires framework app build on MacOSX backend
  + Figure, FigureCanvas, and Backends
    * Figure.frameon is now a direct proxy for the Figure patch visibility state
    * *pil_kwargs* argument added to savefig
    * Add ``inaxes`` method to `.FigureCanvasBase`
    * cairo backend defaults to pycairo instead of cairocffi
  + Axes and Artists
    * axes_grid1 and axisartist Axes no longer draw spines twice
    * Return type of ArtistInspector.get_aliases changed
    * `.ConnectionPatch` accepts arbitrary transforms
    * mplot3d Line3D now allows {set,get}_data_3d
    * ``Axes3D.voxels`` now shades the resulting voxels
  + Axis and Ticks
    * Added `.Axis.get_inverted` and `.Axis.set_inverted`
    * Adjust default minor tick spacing
    * `.EngFormatter` now accepts `usetex`, `useMathText` as keyword only arguments
  + Animation and Interactivity
    * Support for forward/backward mouse buttons
    * *progress_callback* argument to `~.Animation.save()`
    * Add ``cache_frame_data`` keyword-only argument into `.animation.FuncAnimation`
    * Endless Looping GIFs with PillowWriter
    * Adjusted `.matplotlib.widgets.Slider` to have vertical orientation
    * Improved formatting of image values under cursor when a colorbar is present
    * MouseEvent button attribute is now an IntEnum
  + Configuration, Install, and Development
    * The MATPLOTLIBRC environment variable can now point to any "file" path
    * Allow LaTeX code ``pgf.preamble`` and ``text.latex.preamble`` in MATPLOTLIBRC file
    * New logging API
- Switch to upstream-recommended python-cairo instead of
  python-cairocffi

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