Build instructions outdated

[infernix]

FYI:

ionic state restore
[ERROR] ionic state has been removed as of CLI 3.0.

        
        We recommend using Cordova directly to manage Cordova plugins and platforms.
        The following commands fulfill the old ionic state functionality:
        
             ionic cordova platform save   | save existing installed platforms to config.xml
             ionic cordova plugin save     | save existing installed plugins to config.xml
             ionic cordova platform --help | view help page for managing Cordova platforms
             ionic cordova plugin --help   | view help page for managing Cordova plugins
             ionic cordova prepare         | install platforms and plugins listed in config.xml
        
        See https://cordova.apache.org/docs/en/latest/platform_plugin_versioning_ref/ for detail

I've managed to make it work with npm install ionic@2.2.3 cordova@6.5.0