elixir-lang/elixir-lang.github.com — pull request #380 by aseeon (2014-10-27 16:31:49+00:00)
Title: Update to the installation instructions

It was really unclear that the new versions of Elixir require version 17 of erlang and not the version R16 that was fine with erlier versions of elixir (0.11.2 for example). So someone who was upgrading could totally miss it.