_write(info, enc, callback) {
    if (info.exception) {
      return this.transport.log(info, callback);
    }

    callback();
    return true;
  }
Writes the info object to our transport instance if (and only if) the
`exception` property is set on the info.
@param {mixed} info - TODO: add param description.
@param {mixed} enc - TODO: add param description.
@param {mixed} callback - TODO: add param description.
@returns {mixed} - TODO: add return description.
@private