code: function data(originalName, hashedName) {
      var newData = {};
      var key = path.parse(originalName).base;
      var value = path.parse(hashedName).base;
  
      newData[key] = value;
      return newData;
  }
docs: /*
  will return an object of {oldname: newname} to append/update into manifest file.
  input: ('./css/file.css', './file.a1b2c3d4e5.css')   output: {"file.css": "file.a1b2c3d4e5.css"}