Requires build tools version 23

[quintonn]

I tried to follow all the steps to create a docker image and run the cordova commands on an Ubuntu machine, but a few things failed.

Most notably I received an error that i needed to install android build tools version 23.
I modified my local docker file to have 23 and it all worked.

On a side note, the "cordova platform add android" command fails because it can no longer get the android files from the npm repositories.
I had to edit the config.xml file and add the engine with version 5.1.1 and provide a URL to the git repository. Then i ran cordova prepare and that worked. Maybe you want to add this to the main page?
Or i can fork and create a PR if you'll be willing to accept.