Add requirement note for Wordpress 4.7

Referencing: https://discourse.roots.io/t/undefined-function-app-get-theme-file-path/8455
roots · Feb 27, 2017 · 8c5133f · 8c5133f
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@@ -27,6 +27,7 @@ See a working example at [roots-example-project.com](https://roots-example-proje
 
 Make sure all dependencies have been installed before moving on:
 
+* [WordPress](https://wordpress.org/) >= 4.7
 * [PHP](http://php.net/manual/en/install.php) >= 5.6.4
 * [Composer](https://getcomposer.org/download/)
 * [Node.js](http://nodejs.org/) >= 6.9.x