please add an author! + combine editions

[Rianna]

The authors of this book [https://www.goodreads.com/book/show/3... ] are Jeremy Smith and Simon Horobin... but for some reason it only lists Horobin.

Could someone change this please?

Also these editions are the same book, so please combine
- https://www.goodreads.com/book/show/2...
- https://www.goodreads.com/book/show/8...
btw this last one's authors are a mess.. they are also supoosed to be Smith and Horobin..

Thank you!

[Catalina]

Done