utils/shfmt.sh: redirect differences to stderr
utils/shfmt.sh: redirect differences to stderr

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