Add a comment about running in production

Bud Parr

14.16.2018 a89a23cfc47bd6d473b93dcc60ad02b15d6662ac

Add a comment about running in production

ref #106

 README.md

@@ -134,6 +134,13 @@

Now enter [`localhost:1313`](http://localhost:1313/) in the address bar of your browser.

## Production

To run in production (e.g. to have Google Analytics show up), run `HUGO_ENV=production` before your build command. For example:

```
HUGO_ENV=production hugo
```

## Contributing