- 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