octokit/octokit.rb — pull request #413 by mikemcquaid (2014-01-24 00:53:35+00:00)
Title: Faraday::Builder is now Faraday::RackBuilder.

Stops this warning being repeatedly spammed when using Octokit.

I'm perhaps being stupid here but this seemed like an easy fix.
Happy to change it around to get it merged.