Bump version and update release notes

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=154198359

RELEASENOTES.md

@@ -1,5 +1,36 @@
 # Release notes #
 
+### r2.4.0 ###
+
+* New modular library structure. You can read more about depending on individual
+  library modules [here](TODO).
+* Variable speed playback support on API level 16+. You can read more about
+  changing the playback speed [here](TODO)
+  ([#26](https://github.com/google/ExoPlayer/issues/26))."
+* New time bar view, including support for displaying ad break markers.
+* Support DVB subtitles in MPEG-TS and MKV.
+* Support adaptive playback for audio only DASH, HLS and SmoothStreaming
+  ([#1975](https://github.com/google/ExoPlayer/issues/1975)).
+* Support for setting extractor flags on DefaultExtractorsFactory
+  ([#2657](https://github.com/google/ExoPlayer/issues/2657)).
+* Support injecting custom renderers into SimpleExoPlayer using a new
+  RenderersFactory interface.
+* Correctly set ExoPlayer's internal thread priority to `THREAD_PRIORITY_AUDIO`.
+* TX3G: Support styling and positioning.
+* FLV:
+  * Support MP3 in FLV.
+  * Skip unhandled metadata rather than failing
+    ([#2634](https://github.com/google/ExoPlayer/issues/2634)).
+  * Fix potential OutOfMemory errors.
+* ID3: Better handle malformed ID3 data
+  ([#2604](https://github.com/google/ExoPlayer/issues/2604),
+  [#2663](https://github.com/google/ExoPlayer/issues/2663)).
+* FFmpeg extension: Fixed build instructions
+  ([#2561](https://github.com/google/ExoPlayer/issues/2561)).
+* VP9 extension: Reduced binary size.
+* FLAC extension: Enabled 64 bit targets.
+* Misc bugfixes.
+
 ### r2.3.1 ###
 
 * Fix NPE enabling WebVTT subtitles in DASH streams
@@ -302,6 +333,12 @@ in all V2 releases. This cannot be assumed for changes in r1.5.12 and later,
 however it can be assumed that all such changes are included in the most recent
 V2 release.
 
+### r1.5.16 ###
+
+* VP9 extension: Reduced binary size.
+* FLAC extension: Enabled 64 bit targets and fixed proguard config.
+* Misc bugfixes.
+
 ### r1.5.15 ###
 
 * SmoothStreaming: Fixed handling of start_time placeholder

build.gradle

@@ -48,7 +48,7 @@ allprojects {
         releaseRepoName = getBintrayRepo()
         releaseUserOrg = 'google'
         releaseGroupId = 'com.google.android.exoplayer'
-        releaseVersion = 'r2.3.1'
+        releaseVersion = 'r2.4.0'
         releaseWebsite = 'https://github.com/google/ExoPlayer'
     }
     if (it.hasProperty('externalBuildDir')) {

demo/src/main/AndroidManifest.xml

@@ -16,8 +16,8 @@
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.google.android.exoplayer2.demo"
-    android:versionCode="2301"
+    android:versionCode="2400"
-    android:versionName="2.3.1">
+    android:versionName="2.4.0">
 
   <uses-permission android:name="android.permission.INTERNET"/>
   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerLibraryInfo.java

@@ -24,13 +24,13 @@ public interface ExoPlayerLibraryInfo {
    * The version of the library expressed as a string, for example "1.2.3".
    */
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION_INT) or vice versa.
-  String VERSION = "2.3.1";
+  String VERSION = "2.4.0";
 
   /**
    * The version of the library expressed as {@code "ExoPlayerLib/" + VERSION}.
    */
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION) or vice versa.
-  String VERSION_SLASHY = "ExoPlayerLib/2.3.1";
+  String VERSION_SLASHY = "ExoPlayerLib/2.4.0";
 
   /**
    * The version of the library expressed as an integer, for example 1002003.
@@ -40,7 +40,7 @@ public interface ExoPlayerLibraryInfo {
    * integer version 123045006 (123-045-006).
    */
   // Intentionally hardcoded. Do not derive from other constants (e.g. VERSION) or vice versa.
-  int VERSION_INT = 2003001;
+  int VERSION_INT = 2004000;
 
   /**
    * Whether the library was compiled with {@link com.google.android.exoplayer2.util.Assertions}