message: fixed mistake in readme
diff: @@ -158,7 +158,6 @@ The following control overrides are supported:
  label: React.PropTypes.string, //"x"
  className: React.PropTypes.string, //css classNames to be applied
  handleOnClick: React.PropTypes.func, //callback function to invoke removing a <Rule />
  - rules: React.PropTypes.array, //Provides the number of rules already present for this group,
  level: React.PropTypes.number //The level of the current group
  }
  ```
  