Update release notes

Author: afollestad

RELEASE_NOTES.md

@@ -1,3 +1,15 @@
-2.3.1
+3.0.0-RC2
 
-* Set module names for the Kotlin compiler so they don't clash with other third party deps.
+* Detect permanently denied permissions! Changes to `AssentResult`'s structure, it also allows you
+to access `GrantResult`'s for specific permissions.
+* Some internal cleanup and restructuring.
+
+---
+
+3.0.0-RC1
+
+* The library is now split into 3 separate modules. Core, Rationales, and Coroutines.
+* Coroutines support! No callbacks.
+* Upgrade dependencies and project structure.
+* Add `ACCESS_BACKGROUND_LOCATION` to the `Permission` enum.
+* Got rid of Timber for logging (doesn't really make sense for a library). Log to the logcat directly.