playの新しいのを入れたくて、brew updateしようとしたらエラーった(・-・) $ brew update error: The following untracked working tree files would be overwritten by merge: Library/Formula/log4shib.rb Library/Formula/opensaml.rb Library/Formula/xml-security-c.rb Library/Formula/xml-tooling-c.rb Please move or remove them before you can merge. Aborting Error: Failure while executing: git pull -q origin refs/heads/master:refs/remot