Brew: warnings in `brew services list` break parsing

[camdez]

Under some circumstances, brew services list's output may contain "Warning" lines which break this package's ability to parse the output.

For example, my current output of the command is:

Warning: Calling bottle :unneeded is deprecated! There is no replacement.
Please report this issue to the lucagrulla/tap tap (not Homebrew/brew or Homebrew/core):
  /usr/local/Homebrew/Library/Taps/lucagrulla/homebrew-tap/Formula/cw.rb:9

Warning: Calling bottle :unneeded is deprecated! There is no replacement.
Please report this issue to the polyfy/polylith tap (not Homebrew/brew or Homebrew/core):
  /usr/local/Homebrew/Library/Taps/polyfy/homebrew-polylith/Formula/poly.rb:8

Name        Status  User   File
offlineimap started camdez ~/Library/LaunchAgents/homebrew.mxcl.offlineimap.plist
redis       stopped        
syncthing   started camdez ~/Library/LaunchAgents/homebrew.mxcl.syncthing.plist
unbound     stopped        

(FWIW, these lines are printed to STDERR, but still are included in the text returned by daemons--shell-command-to-string.)

PR to follow promptly.

[cbowdon]

Thanks! 🙏