Open
Description
The documentation at https://square.github.io/retrofit/ does not tell users about the existing RxJava, Guava and Java8 adapter options.
Also, I realize that you want to keep the project small but you could at least link to some other call adapters. I'm looking at https://github.com/square/retrofit/tree/master/retrofit-adapters which misses support for Bolts and Agera (lightweight Rx). Many people already have Bolts via the Facebook SDK and Agera is nice to know when you can't use multidex as Rx is giant.
Here are links to implementations:
https://github.com/zeng1990java/retrofit-bolts-call-adapter
https://github.com/drakeet/retrofit-agera-call-adapter