Update NodeInfo support to 2.1 (#79)
I updated NodeInfo following upstream spec (https://github.com/jhass/nodeinfo/blob/master/schemas/2.1/schema.json), by replacing 2.0 by 2.1 (I assume only 2.1 version need to be supported). Only repository field was added.
I tested it by building and starting the docker container, but I don't really know how to test it more.
Note : this is my first time writing Elixir code :-)
Edited by Julien Lavergne