title: Unresolved reference: Observable in Android Studio 3.4
body: <p>Updated to Android Studio 3.4, with Gradle 5.1.1 and Kotlin 1.3.10 as minimum versions. Cannot run project anymore due to reactivex.Observable not being found. Has anyone found a solution?</p>
  
  <p>Was using rxBinding lib, also tried using latest vesions RxJava 2.2.8 and RxAndroid 2.1.1 with no success.</p>