Bump node-sass from 4.12.0 to 4.13.1 in /chat-frontend#4

dependabot[bot] wants to merge 1 commit intomasterbrute-force/chat:masterfrom

dependabot/npm_and_yarn/chat-frontend/node-sass-4.13.1brute-force/chat:dependabot/npm_and_yarn/chat-frontend/node-sass-4.13.1Copy head branch name to clipboard