Add changelog for Qt 5.6.2 release

Change-Id: Iad025f4e6273c3f1602e32059ad0fea708e56433
Reviewed-by: Karsten Heimrich <karsten.heimrich@qt.io>

dist/changes-5.6.2

+Qt 5.6.2 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                                         *
+****************************************************************************
+
+ - idc:
+   * [QTBUG-55332] idc can now handle library path names with space
+     characters.