update without running spec-cleaner, so hopefully everything should be OK

- update to version 3.0.2:
* Un-breaks basemap which was broken by partially restoring private
APIs for cartopy.
* Fixes bug in warning code when used in an embedded context.
* Fixes crash when using Tk and closing the first open window before
showing it
* Many documentation improvements.
* Restore a corner case on ColorBar tick usage.
* Change the default behavior of `matplotlib.use` to silently allow
more 'safe' switching after auto-discovery, but before starting an
event loop.
* Improvements to bounding box calculations.
* Provide the correct length for RcParams instances.