[Snyk] Security upgrade html-proofer from 3.14.1 to 3.15.0#17

irinazheltisheva wants to merge 1 commit intomasterhttps-githubsup-com/pixellate:masterfrom

snyk-fix-e194d2d683ea849609442d685f3e9606https-githubsup-com/pixellate:snyk-fix-e194d2d683ea849609442d685f3e9606Copy head branch name to clipboard