Add QtSensor changelog for Qt 5.3.0

Change-Id: I34160176dec6525e908956959c0749a199e45a2b
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Reviewed-by: Andrew Inwood <ainwood@blackberry.com>