Complete/error tracked expression with inner observables

[kosich]

If underlying observables of tracked expression complete — the resulting observable should complete too, e.g:

const o = of(1);
const r = run(() => $(o));
r.subscribe({
  next: v => console.log(v),
  complete: () => console.log('DONE')
});

Current behavior

> 1

Expected behavior

> 1
> DONE

(same goes with errors)

[kosich]

Resolved in #5