Does not work with async functions

Running `:JsDoc` on the following function does not work properly. 

`const doSomething = async (param1, param2, param3) => {}` turns into:

```
/**
 * @type = {}
 */
```

Instead, I believe it should say the below (like it does without the `async`):
```
/**
 * doSomething.
 * @param {} param1
 * @param {} param2
 */
```