How to deal with commands of conflicting names listed in `brew doctor`? So after brew doctorI`ll get the following without any recommendation:

Warning: You have external commands with conflicting names.

Found command `brew-cask` in following places:
/usr/local/bin/brew-cask
/usr/local/Library/Taps/caskroom/homebrew-cask/cmd/brew-cask.rb


Is there a way to settle that conflict?
Important December update (from https://github.com/caskroom/homebrew-cask):

Homebrew-Cask will now be kept up to date together with Homebrew.

If you haven’t yet, to switch to the new system, run:

brew uninstall --force brew-cask; brew update