Proposal : Update Anime Sanzoku no Musume Ronja source

Proposal details

This proposal will make the following change(s):

Update the source of the anime Sanzoku no Musume Ronja

Change the source from Unknown to Novel

Based on the following reason: Source is a book the anime was based on. I've read the book. But since we don't have a book as a source option, novel is the closest one.

With the source: https://myanimelist.net/anime/22359/Sanzoku_no_Musume_Ronja