[Snyk] Upgrade node-sass from 4.13.0 to 4.13.1#2

snyk-bot wants to merge 1 commit intomastercontentascode/metalsmith-sass:masterfrom

snyk-upgrade-8a08826f284fc3b4ab34e5c2751fefd3contentascode/metalsmith-sass:snyk-upgrade-8a08826f284fc3b4ab34e5c2751fefd3Copy head branch name to clipboard