Importing created subdirectory index files

Hello! Thanks so much for the great work on **create-index**! I apologize if this has been brought up before, after some time of searching the issues and pull requests I could not find mention of it.

I have a library project with some deeper source folders and much to my delight **create-index** does indeed create `index.js` files exactly how I was looking for, short of one thing. When creating a parent folder's `index.js` and using the recurse into subfolders option the parent folder's `index.js` will not import the child folder's. To further call the inconsistency out, subsequent runs of **create-index** will properly import the child folder's now created `index.js`.

I'd be happy to submit a PR if this seems like a feature that should be included, especially if it's something someone unfamiliar with the source can easily jump in and do, say if it's a matter of swapping the order of generation.

Thank you for your time!