Update markdown to 3.5.1#1021

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

pyup-update-markdown-2.6.2-to-3.5.1cclauss/pythonista-module-versions:pyup-update-markdown-2.6.2-to-3.5.1Copy head branch name to clipboard