message: chore(test): fix do types
diff: @@ -46,7 +46,7 @@ describe('Observable.prototype.do', () => {
  it('should handle everything with an observer', (done: MochaDone) => {
  const expected = [1, 2, 3];
  - const results = [];
  + const results: number[] = [];
  Observable.of(1, 2, 3)
  .do(<Rx.Observer<number>>{
  @@ -101,7 +101,7 @@ describe('Observable.prototype.do', () => {
  it('should handle an error with observer', () => {
  let errored = false;
  - Observable.throw('bad').do(<any>{ error: function (err) {
  + Observable.throw('bad').do(<any>{ error: function (err: string) {
  expect(err).to.equal('bad');
  } })
  .subscribe(null, function (err) {
  