mac 安装 chromedriver

$ brew cask install chromedriver
==> Satisfying dependencies
==> Downloading https://chromedriver.storage.googleapis.com/2.45/chromedriver_mac64.zip
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==> Verifying SHA-256 checksum for Cask \'chromedriver\'.
==> Installing Cask chromedriver
==> Linking Binary \'chromedriver\' to \'/usr/local/bin/chromedriver\'.