message: fix(subscribeOn): add subscribeOn back to the distribution
diff: @@ -73,13 +73,7 @@ export { skipLast } from './skipLast';
  export { skipUntil } from './skipUntil';
  export { skipWhile } from './skipWhile';
  export { startWith } from './startWith';
  -/**
  - * TODO(https://github.com/ReactiveX/rxjs/issues/2900): Add back subscribeOn once it can be
  - * treeshaken. Currently if this export is added back, it
  - * forces apps to bring in asap scheduler along with
  - * Immediate, root, and other supporting code.
  - */
  -// export { subscribeOn } from './subscribeOn';
  +export { subscribeOn } from './subscribeOn';
  export { switchAll } from './switchAll';
  export { switchMap } from './switchMap';
  export { switchMapTo } from './switchMapTo';
  