Bump html-proofer from 3.14.1 to 3.19.4#26

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

dependabot/bundler/html-proofer-3.19.4s994n/github-slideshow:dependabot/bundler/html-proofer-3.19.4Copy head branch name to clipboard