Implement for RxJava 2

[daimonkor]

Please implement logging for new RxJava 2
Caused by: java.lang.ClassNotFoundException: Didn't find class "rx.Observable" on path: DexPathList[[zip file "/data/app/***/base.apk"],nativeLibraryDirectories=[/data/app/***/lib/x86, /system/lib, /vendor/lib]]
Thanks for your support.

[AlexTrotsenko]

I will just post it here for the info purposes:
#33