Setting the skin option is not shown in the README.md #5
Description
In the README.md there is no explaining how to set the skin option:
https://github.com/xzegga/angular2-knob#options
Like in the original ng-knob:
skin | object | { type: 'simple', width: 10, color: 'rgba(255,0,0,.5)', spaceWidth: 5 } | Type: simple or tron