Backport PR #13080 on branch v3.0.x (Pin pillow to < 5.4 to fix doc build)#13082

dstansby merged 1 commit intomatplotlib:v3.0.xmatplotlib/matplotlib:v3.0.xfrom

meeseeksmachine:auto-backport-of-pr-13080-on-v3.0.xmeeseeksmachine/matplotlib:auto-backport-of-pr-13080-on-v3.0.xCopy head branch name to clipboard