Homebrew/homebrew — pull request #28878 by xu-cheng (2014-05-01 05:08:17+00:00)
Title: fix brew config in zsh_completion

You change `brew --config` to `brew config` in https://github.com/Homebrew/homebrew/commit/273bbfda3353abd58f77aef66523a9617fa30128. But didn't update zsh_completion correctly.