Add change file for Qt 5.6.3

Task-number: QTBUG-62720
Change-Id: I1cfb0ef390f1e7d8f1cb289f898e7915201f7ea1
Reviewed-by: Martin Smith <martin.smith@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

dist/changes-5.6.3

+Qt 5.6.3 is a bug-fix release. It maintains both forward and backward
+compatibility (source and binary) with Qt 5.6.0.
+
+For more details, refer to the online documentation included in this
+distribution. The documentation is also available online:
+
+  http://doc.qt.io/qt-5/index.html
+
+The Qt version 5.6 series is binary compatible with the 5.5.x series.
+Applications compiled for 5.5 will continue to run with 5.6.
+
+Some of the changes listed in this file include issue tracking numbers
+corresponding to tasks in the Qt Bug Tracker:
+
+  https://bugreports.qt.io/
+
+Each of these identifiers can be entered in the bug tracker to obtain more
+information about a particular change.
+
+****************************************************************************
+*                          Library                                         *
+****************************************************************************
+
+lupdate
+-------
+
+ - [QTBUG-53206] Added qrc resource file support