Bump json5, webpack and webpack-cli in /lit-element-0.6#200

dependabot[bot] wants to merge 1 commit into

mastershprink/web-components-todo:masterfrom

dependabot/npm_and_yarn/lit-element-0.6/json5-and-webpack-and-webpack-cli--removedshprink/web-components-todo:dependabot/npm_and_yarn/lit-element-0.6/json5-and-webpack-and-webpack-cli--removedCopy head branch name to clipboard