I made a few improvements to the library,
Added request options
Added JSON to runtime dependencies, required by faraday-middleware
The request options change looks good to me. I think it might be better to make json a development_dependency as we don't need to mandate a parser lib other than for development.
True that, i'll commit right now.
Require json gem only for development
In the future if we add any configuration we can move REQUEST_OPTIONS, but for now that'll do. Nice job!