Update matplotlib to 3.3.1#511

pyup-bot wants to merge 1 commit intomastercclauss/pythonista-module-versions:masterfrom

pyup-update-matplotlib-1.4.0-to-3.3.1cclauss/pythonista-module-versions:pyup-update-matplotlib-1.4.0-to-3.3.1Copy head branch name to clipboard