Bump ws from 7.4.2 to 7.4.6 in /nodejs#3

dependabot[bot] wants to merge 1 commit intomastervirbo/tutorial:masterfrom

dependabot/npm_and_yarn/nodejs/ws-7.4.6virbo/tutorial:dependabot/npm_and_yarn/nodejs/ws-7.4.6Copy head branch name to clipboard