Update changes.md and readme.md

Author: akarnokd

CHANGES.md

@@ -2,6 +2,13 @@
 
 Version 1.x can be found at https://github.com/ReactiveX/RxJava/blob/1.x/CHANGES.md
 
+### Version 2.0.0-RC2 - September 5, 2016 ([Maven](http://search.maven.org/#artifactdetails%7Cio.reactivex.rxjava2%7Crxjava%7C2.0.0-RC2%7C))
+
+This Release Candidate features a large amount of internal fixes, cleanups and enhancements. Please refer to the [closed PRs](https://github.com/ReactiveX/RxJava/pulls?q=is%3Apr+is%3Aclosed+milestone%3A%222.0+RC+2%22) for its milestone. This includes the bugfix for the `Single.subscribeOn` failing with `Disposable already set!` error printed to the console ([Issue 4448](https://github.com/ReactiveX/RxJava/issue/4448), [Pull 4450](https://github.com/ReactiveX/RxJava/pull/4450)).
+
+The library now has a new base reactive type: `Maybe` which is essentially a `Single` and `Completable` combined. You can have exactly 1 onSuccess, 1 onError or 1 onComplete signals with it. Note however that it doesn't have all the operators possible for this type of source but you can convert it back and forth to the other base reactive types (i.e., `Flowable`, `Single`, `Completable` and `Observable`). Unlike Project Reactor's `Mono` type, this doesn't implement the Reactive-Streams `Publisher` (but is designed along the idea) and doesn't have backpressure (as there is no chance of buffer-bloat like with unknown length `Flowable`s and `Observable`s).
+
+
 ### Version 2.0.0-RC1 - August 25, 2016 ([Maven](http://search.maven.org/#artifactdetails%7Cio.reactivex.rxjava2%7Crxjava%7C2.0.0-RC1%7C))
 
 RxJava 2.0 has been rewritten from scratch to be more performant, lower overhead (memory and cpu) and to natively implement the Reactive-Streams specification in its new `Flowable` type. The library still supports Java 6+ and is considered a **4th generation reactive library**.

README.md

@@ -28,8 +28,10 @@ See the differences between version 1.x and 2.x in the wiki article [What's diff
 The release plan for 2.x is as [follows](https://github.com/ReactiveX/RxJava/issues/4016):
 
   - **25/08/2016: Release Candidate 1: stabilized API and feature set**
-  - 23/09/2016: Release Candidate 2: addressing feedback from RC 1
-  - 21/10/2016: Release Candidate 3: addressing feedback from RC 2
+  - **05/09/2016: Release Candidate 2: addressing feedback from RC 1**
+  - 23/09/2016: Release Candidate 3: addressing feedback from RC 2
+  - 07/10/2016: Release Candidate 4: addressing feedback from RC 3
+  - 21/10/2016: Release Candidate 5: addressing feedback from RC 4
   - 29/10/2016: Stable Release: General availability
 
 ## Communication
@@ -112,8 +114,8 @@ To build:
 
 ```
 $ git clone [email protected]:ReactiveX/RxJava.git
-$ git checkout -b 2.x
 $ cd RxJava/
+$ git checkout -b 2.x
 $ ./gradlew build
 ```