chore: update README for Rotation Persist eg

kaushikgopal · web-flow · commit ac14b1f8ac5b · 2016-10-23T21:23:25.000-07:00
courtesy: kaushikgopal#80
diff --git a/README.md b/README.md
@@ -173,6 +173,10 @@ Hit the start button and rotate the screen to your heart's content; you'll see t
 
 *There are certain quirks about the "hotness" of the source observable used in this example. Check [my blog post](http://blog.kaush.co/2015/07/11/a-note-about-the-warmth-share-operator/) out where I explain the specifics.*
 
+I have since rewritten this example using an alternative approach. While the [`ConnectedObservable` approach worked](https://github.com/kaushikgopal/RxJava-Android-Samples/blob/master/app/src/main/java/com/morihacky/android/rxjava/fragments/RotationPersist1WorkerFragment.java#L20) it enters the lands of "multicasting" which can be tricky (thread-safety, .refcount etc.). Subjects on the other hand are far more simple.  You can see it rewritten [using a `Subject` here](https://github.com/kaushikgopal/RxJava-Android-Samples/blob/master/app/src/main/java/com/morihacky/android/rxjava/fragments/RotationPersist2WorkerFragment.java#L22).
+
+I wrote [another blog post](https://tech.instacart.com/how-to-think-about-subjects-part-1/) on how to think about Subjects where I go into some specifics.
+
 ### Pagination
 
 I leverage the simple use of a Subject here. Honestly, if you don't have your items coming down via an `Observable` already (like through Retrofit or a network request), there's no good reason to use Rx and complicate things.
