Update matplotlib to 3.2.1

[pyup-bot]

This PR updates matplotlib from 1.4.0 to 3.2.1.

Changelog

3.2.1

This is the first bugfix release of the 3.2.x series.

This release contains several critical bug-fixes:

- fix `Quiver.set_UVC` calls with scalar inputs
- fix `bezier.get_parallels` failure from floating point rounding errors
- fix markers specified as tuples (polygons, stars, or asterisks)
- fix saving PNGs to file objects in some places
- fix saving figures using the nbAgg/notebook backend
- fix saving with tight layout using the PGF backend
- fix setting custom datapath in rcParams (note: it is still deprecated)
- fix various issues running setup.py in non-CI environments
- fix xpdf distiller
- various minor bug and documentation fixes

3.2.0rc1

This is the first release candidate from Matplotlib 3.2

3.1.1

The first bug-fix release of the 3.1 series

* Locator.nonsingular return order API change

Lots of backports of various bug fixes.

2.1.0

This is the second minor release in the Matplotlib 2.x series and the first
release with major new features since 1.5.

This release contains approximately 2 years worth of work by 275 contributors
across over 950 pull requests.  Highlights from this release include:

- support for string categorical values
- export of animations to interactive javascript widgets
- major overhaul of polar plots
- reproducible output for ps/eps, pdf, and svg backends
- performance improvements in drawing lines and images
- GUIs show a busy cursor while rendering the plot


along with many other enhancements and bug fixes.

Links

• PyPI: https://pypi.org/project/matplotlib
• Changelog: https://pyup.io/changelogs/matplotlib/
• Homepage: https://matplotlib.org

[pyup-bot]

Closing this in favor of #488