もうなんかやだな。。。brewは

[(´・ω・｀)@Zset ~]$ brew update

    Error:
 homebrew-core is a shallow clone.
 homebrew-cask is a shallow clone.
To `brew update`, first run:
 git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow
 git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask fetch --unshallow
This restriction has been made on GitHub's request because updating shallow
clones is an extremely expensive operation due to the tree layout and traffic of
Homebrew/homebrew-core and Homebrew/homebrew-cask. We don't do this for you
automatically to avoid repeatedly performing an expensive unshallow operation in
CI systems (which should instead be fixed to not use shallow clones). Sorry for
the inconvenience!

書いてる通りではあるのだが、使わんし知らんっちゅうねん。