message: build(rollup): ignore rollup warning
diff: @@ -101,6 +101,8 @@ function generateBuildConfigs(packagesName) {
  // rename
  if (name === 'core') {
  config.output.name = 'BScroll'
  + /** Disable warning for default imports */
  + config.output.exports = 'named'
  // it seems the umd bundle can not satisfies our demand
  config.output.footer = 'window.BScroll = window.BScroll.default;\n'
  }
  