fix Event observable access

Author: Alex

reactiveviewmodel/src/main/java/com/alexdeww/reactiveviewmodel/core/common/RvmComponent.kt

@@ -32,4 +32,6 @@ interface RvmComponent {
 
     val <T> Event<T>.consumer: Consumer<T> get() = this.consumer
 
-}
+    val <T> Event<T>.observable: Observable<T> get() = this.observable
+
+}