Bump socket.io from 2.2.0 to 2.4.0 in /20190625-isaac#2

dependabot[bot] wants to merge 1 commit into

masterkoenkivits/slides:masterfrom

dependabot/npm_and_yarn/20190625-isaac/socket.io-2.4.0koenkivits/slides:dependabot/npm_and_yarn/20190625-isaac/socket.io-2.4.0Copy head branch name to clipboard