PartitionManager links to and uses GPLv3 libraries, so switch license to GPLv3+.

src/org.kde.PartitionManager.appdata.xml

@@ -2,7 +2,7 @@
 <component type="desktop">
   <id>org.kde.PartitionManager.desktop</id>
   <metadata_license>CC0-1.0</metadata_license>
-  <project_license>GPL-2.0+</project_license>
+  <project_license>GPL-3.0+</project_license>
   <name>KDE Partition Manager</name>
   <name xml:lang="ar">مدير أقسام كدي</name>
   <name xml:lang="ca">Gestor de particions del KDE</name>

src/util/helpers.cpp

@@ -115,7 +115,7 @@ KAboutData* createPartitionManagerAboutData()
 		xi18nc("@title", "<application>KDE Partition Manager</application>"),
 		QStringLiteral(VERSION),
 		i18nc("@title", "Manage your disks, partitions and file systems"),
-		KAboutLicense::GPL,
+		KAboutLicense::GPL_V3,
 		i18nc("@info:credit", "© 2008-2013 Volker Lanz"));
 	about->setOrganizationDomain(QByteArray("kde.org"));
 	about->setProductName(QByteArray("partitionmanager"));