message: fix build-flow script on config package
diff: @@ -14,7 +14,9 @@ import {cp} from './util';
  // Non-recursively copy src/*.js to dist/*.js.flow:
  readdirSync('src').forEach(entry => {
  + if (entry.endsWith('.js')) {
  const source = join('src', entry);
  const destination = join('dist', `${entry}.flow`);
  cp(source, destination);
  + }
  });
  