Support for @include directives

[Nidish96]

I tried running this on a file with @include directives and got errors.

I'm assuming this is not supported yet. I'd be grateful if you included support for it.

[HeinerTholen]

Yes, really sorry. Includes are not supported.

I haven't worked with this lib in a long time.

But since it's only a small project, I'm happy to put a little time into its maintainance. If you were to make a pull request, I'll try to review and merge it promptly.

[HeinerTholen]

Also, there isn't any mention of contributers yet. I'd create that as well.