message: add accuracy to IExportOptions
diff: @@ -4,8 +4,14 @@ namespace MakerJs.exporter {
  * @private
  */
  export interface IExportOptions {
  +
  + /**
  + * Optional exemplar of number of decimal places.
  + */
  + accuracy?: number;
  +
  /**
  - * Unit system to embed in exported file.
  + * Optional unit system to embed in exported file.
  */
  units?: string;
  }
  