utils: send output to stderr by default for `ensure_formula_installed!`
utils: send output to stderr by default for `ensure_formula_installed!`

MikeMcQuaid/brew,nandub/brew,Homebrew/brew,JCount/brew,Homebrew/brew,nandub/brew,Homebrew/brew,nandub/brew,JCount/brew,MikeMcQuaid/brew,JCount/brew,MikeMcQuaid/brew,nandub/brew,Homebrew/brew,MikeMcQuaid/brew,JCount/brew