Pug parser : Include not supported

Hi :)

I'm trying to generate my component documentation, but an error is raised:

`TypeError: A child of Block (Pug:2) is of type Include, which is not supported by pug-code-gen. Please use pug-linker to preprocess this AST.`

Here is the template parsed:
```
<template lang="pug">
    include configured.pug
</template>
```

If you need more information. Let me know.