build(deps-dev): bump webpack-dev-server from 2.11.5 to 3.1.11 in /client#6

dependabot[bot] wants to merge 1 commit intomastertuture-dev/vue-online-shop-frontend:masterfrom

dependabot/npm_and_yarn/client/webpack-dev-server-3.1.11tuture-dev/vue-online-shop-frontend:dependabot/npm_and_yarn/client/webpack-dev-server-3.1.11Copy head branch name to clipboard