Update module version to 5.2.0

Change-Id: I7ef98de17bd2aafdf6cb33572a1ed05b13105e2b
Reviewed-by: David Faure (KDE) <faure@kde.org>
Reviewed-by: Laszlo Papp <lpapp@kde.org>

.qmake.conf

 load(qt_build_config)
 CONFIG += qt_example_installs
 
-MODULE_VERSION = 5.1.0
+MODULE_VERSION = 5.2.0