Add alternative method for running prod to the readme (#273)

README.md

@@ -157,6 +157,12 @@ To run in production (e.g. to have Google Analytics show up), run `HUGO_ENV=prod
 HUGO_ENV=production hugo
 ```
 
+Note: The above command will not work on Windows. If you are running a Windows OS, use the below command:
+
+```
+hugo --environment production
+```
+
 ## Contributing
 
 If you find a bug or have an idea for a feature, feel free to use the [issue tracker](https://github.com/budparr/gohugo-theme-ananke/issues) to let me know.