typo import rx.lang.kotlin.subscribeBy

[diegopego]

thanks for your work! in https://thomasnield.gitbooks.io/rxjavafx-guide/content/2.%20RxJava%20Fundamentals.html] thre is a reference to import rx.lang.kotlin.subscribeBy and should be import io.reactivex.rxkotlin.subscribeBy

[thomasnield]

In the documentation only? I'll fix, thanks!