Set host address to 0.0.0.0 for docker

If the project built from this is being run inside a docker
container, this setting is very important.

Author: js-jslog

templates/webpack-es6/webpack.config.js

@@ -10,6 +10,7 @@ module.exports = {
   },
   devtool: 'inline-source-map',
   devServer: {
+    host: '0.0.0.0',
     contentBase: './dist',
     port: 3000,
   },