Add comment explaining alternate plural solution
Add comment explaining alternate plural solution

Before I saw a suggestion by @lencioni [1] to solve matching plural
folder names, I had already implemented a solution. To keep some of that
discussion, and to highlight that the plural matching can be
problematic, I'm injecting a comment to explain the alternative
solution.

[1]: https://github.com/trotzig/import-js/issues/127#issuecomment-172249242

lencioni/import-js,lencioni/import-js,trotzig/import-js,Galooshi/import-js,trotzig/import-js,trotzig/import-js,lencioni/import-js