dep status has some really awesome output that you can use to generate pretty graphs! 🎉 This is awesome! ❤️ But it's not clear how to use it to actually view the pretty graphs....

Let's add to the README how to generate and view these visualizations.

For example, on my Mac, I can run the following commands to make this picture pop up on the screen:

$ brew install graphviz
$ dep status -dot | dot -T png | open -f -a /Applications/Preview.app