NODE_API.md does not to indicate support for .yml configuration, but I can?

Was reading the the docs, and wanted to make use of the configuration mentioned [here](https://github.com/documentationjs/documentation/blob/master/docs/CONFIG.md), with the nodejs apis.

But, I couldn't find any mention of it in the [nodejs api docs](https://github.com/documentationjs/documentation/blob/master/docs/NODE_API.md). Had to do some digging into the source to see what was truly available (it is).

Posting this issue here; hoping it might save someone the time in the future, if they're looking to do the same:

```
var documentation = require('documentation');
documentation.build('src/**', { config: 'documentation.yml' }).then((res) => {

});
```
^ This seemed to have worked for me.

* What version of documentation.js are you using?: 12.1.4
* How are you running documentation.js (on the CLI, Node.js API, Grunt, other?): Node.js API