_updatePaths() {
    for (let i = 0; i < this.__paths.length; i++) {
      let path = this.__paths[i];

      let pathProgress = this._getElapsedProgress(path);

      path.progress = this._getProgress(pathProgress, path.ease);
      this._setLine(path);
      this._updatePosition(path);
      this._updateStrokeCallbacks(path);
    }
  }
_paint
Responsible for animating paths.
Path incrementation is performed using requestAnimationFrame.
@private
@param  {number} timestamp   identifies current time
@param  {object} data        contains options set on init() and paint()