message: fix(rxjs): make sure esm imports from index.js by default, not Rx.js
  fixes
diff: @@ -39,8 +39,8 @@ fs.removeSync(PKG_ROOT);
  let rootPackageJson = Object.assign({}, pkg, {
  name: 'rxjs',
  - main: './Rx.js',
  - typings: './Rx.d.ts'
  + main: './index.js',
  + typings: './index.d.ts'
  });
  // Get a list of the file names. Sort in reverse order so re-export files
  