brew updateでエラーでたった[Homebrew]$ brew update error: Your local changes to the following files would be overwritten by merge: Library/Formula/mysql.rb Please, commit your changes or stash them before you can merge. error: Your local changes to the following files would be overwritten by merge: README.md Please, commit your changes or stash them before you can merge. Aborting Error: Failure while executing: git pull -q origin ref
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