Mac安装chromedriver和geckodriver

DY@MacBook-Pro bin$brew install chromedriver
Error: No available formula with the name "chromedriver"
It was migrated from homebrew/core to homebrew/cask.
You can access it again by running:
  brew tap homebrew/cask
And then you can install it by running:
  brew cask install chromedriver
DY@MacBook-Pro bin$brew cask install chromedriver
==> Tapping homebrew/cask
Cloning into '/usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask'...
remote: Enumerating objects: , done.
remote: Counting objects: % (/), done.
remote: Compressing objects: % (/), done.
remote: Total  (delta ), reused  (delta ), pack-reused
Receiving objects: % (/), 1.33 MiB | 816.00 KiB/s, done.
Resolving deltas: % (/), done.
Tapped  command and  casks (, files, .2MB).
==> Satisfying dependencies
==> Downloading https://chromedriver.storage.googleapis.com/2.44/chromedriver_ma
######################################################################## 100.0%
==> Verifying SHA- checksum for Cask 'chromedriver'.
==> Installing Cask chromedriver
==> Creating Caskroom at /usr/local/Caskroom
==> We'll set permissions properly so we won't need sudo in the future.
Password:
Sorry, try again.
Password:
==> Linking Binary 'chromedriver' to '/usr/local/bin/chromedriver'.