Maybe wrong documentation.

[armintelker]

The current version of Completable.subscribe don't take anymore Completable.CompletableSubscriber() you could use CompletableObserver

[armintelker]

 write.subscribe(new CompletableObserver() {
            @Override
            public void onSubscribe(Disposable disposable) {

            }

            @Override
            public void onComplete() {

            }

            @Override
            public void onError(Throwable throwable) {

            }
        });

[pakoito]

Any PR to the docs to fix it would be fine. It's not a big issue :D

[kishandonga]

#10 resolved this issue