[DONE] Please fix authorship in this edition

[Armando]

This edition of Heidi wrongly attributes authorship to three persons, probably due to an error in the amazon page.

Johanna Spyri is the sole author, please correct the misattributed authorship credits to the following:
- Angelo Rinaldi (Illustrator)
- Beverly Cleary (Foreword)

note: based on this edition's cover

[Arenda]

"Illustrator" and "Foreword" added to these contributors.

It might take some time for this update to show on the book page.