docs(configuration) Update minimal config example (#2482)

I'm not the first person to forget this import webpack/webpack-dev-server#823
webpack · Sep 2, 2018 · 726cf82 · 726cf82
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commit 726cf82
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diff --git a/src/content/configuration/dev-server.md b/src/content/configuration/dev-server.md
@@ -24,6 +24,8 @@ T> Options that are compatible with [webpack-dev-middleware](https://github.com/
 This set of options is picked up by [webpack-dev-server](https://github.com/webpack/webpack-dev-server) and can be used to change its behavior in various ways. Here's a simple example that gzips and serves everything from our `dist/` directory:
 
 ```js
+var path = require('path');
+
 module.exports = {
   //...
   devServer: {