code: function (from, to) {
        return rename(path.resolve(target, from), path.resolve(target, to))
      }
docs: /*
  Rename a file, relative to the target.
  @param {String} from - the path to the file, relative to the target.
  @param {String} to - the new path to the file, relative to the target.
  @return {Promise} - a promise to rename the file.