如何看Homebrew某個Fomula所包含的版本

以Maven為例

$ brew versions maven
#3.0.4    git checkout 1dc42b3 /usr/local/Library/Formula/maven.rb
#3.0.3    git checkout 14e4db3 /usr/local/Library/Formula/maven.rb
#3.0.2    git checkout 03b288a /usr/local/Library/Formula/maven.rb
#3.0.1    git checkout 83857d6 /usr/local/Library/Formula/maven.rb
#3.0      git checkout 09a0264 /usr/local/Library/Formula/maven.rb
#2.2.1    git checkout d40d419 /usr/local/Library/Formula/maven.rb

# install the specific version of Maven
# usage: brew switch [formula] [version]
brew switch maven 3.0.3
brew install maven