Bump html-proofer from 3.14.1 to 3.19.1#5

dependabot[bot] wants to merge 1 commit intomasters994n/github-slideshow:masterfrom

dependabot/bundler/html-proofer-3.19.1s994n/github-slideshow:dependabot/bundler/html-proofer-3.19.1Copy head branch name to clipboard