This is handy if you have already upgraded and cleaned the older version from the Cellar.
Uninstall the latest version:
brew uninstall kubernetes-cli
Find the git SHA1 for the version that you want, then find the raw link from github, and install from it:
brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/d09d97241b17a5e02a25fc51fc56e2a5de74501c/Formula/kubernetes-cli.rb