This reverts commit 64a95435814632a7d71d5a77157c40259a6acf8d. Use HOMEBREW_CIRCLECI rather than CIRCLECI. See https://github.com/Homebrew/brew/pull/5402
This reverts commit 64a95435814632a7d71d5a77157c40259a6acf8d. Use HOMEBREW_CIRCLECI rather than CIRCLECI. See https://github.com/Homebrew/brew/pull/5402