Update changelog for 5.2.1

Change-Id: Id1df662afb2ec0e7eb7055bbc2c5c523a5bda125
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

dist/changes-5.2.1

@@ -0,0 +1,35 @@
+Qt 5.2.1 is a bug-fix release. It maintains both forward and backward
+compatibility (source and binary) with Qt 5.2.0.
+
+For more details, refer to the online documentation included in this
+distribution. The documentation is also available online:
+
+  http://qt-project.org/doc/qt-5.2
+
+The Qt version 5.2 series is binary compatible with the 5.1.x series.
+Applications compiled for 5.1 will continue to run with 5.2.
+
+Some of the changes listed in this file include issue tracking numbers
+corresponding to tasks in the Qt Bug Tracker:
+
+  http://bugreports.qt-project.org/
+
+Each of these identifiers can be entered in the bug tracker to obtain more
+information about a particular change.
+
+****************************************************************************
+*                          Library                                         *
+****************************************************************************
+
+QtMultimedia
+------------
+
+ - Android:
+   * [QTBUG-31422] The mediaplayer can now read files from the Qt
+     Resource system.
+   * [QTBUG-35416] QVideoProbe is now functional when used with a camera
+     source
+   * [QTBUG-35086] Fixed VideoOutput not showing video frames in the
+     correct orientation when used with a Camera.
+   * [QTBUG-35868] Multiple MediaPlayer elements now show correct video
+     frames when playing simultaneously.