build(deps): bump json5, babel-loader, html-webpack-plugin and webpack in /PWA#79

dependabot[bot] wants to merge 1 commit intomasterxcyn/webpack-study:masterfrom

dependabot/npm_and_yarn/PWA/json5-and-babel-loader-and-html-webpack-plugin-and-webpack-2.2.3xcyn/webpack-study:dependabot/npm_and_yarn/PWA/json5-and-babel-loader-and-html-webpack-plugin-and-webpack-2.2.3Copy head branch name to clipboard