[Snyk] Security upgrade html-proofer from 3.7.2 to 3.15.0#46

lyoha1988 wants to merge 1 commit intomasterlyoha1988/github-slideshow:masterfrom

snyk-fix-5f3b31b03d43b6fe79586588028ff7e0lyoha1988/github-slideshow:snyk-fix-5f3b31b03d43b6fe79586588028ff7e0Copy head branch name to clipboard