Nice, thanks guys. 
I still have two problems with the marketplace though:
- It says that there is “No release yet” which is not true (I think this worked before).
- The images in the readme are not working since they are relative URLs.
I guess I could also change them to be absolute in the readme but imho it would make sense to automatically rewrite relative URLs to absolute ones in the marketplace.
…and “Not found what you are looking for? Let us know what you’d like to see in the Marketplace!” points to a dead link (https://www.graylog.org/go/marketplace_requests) ^^