Bump MODULE_VERSION to 5.1.2
Bump MODULE_VERSION to 5.1.2

Change-Id: Iecde0c3af8be02e73ba993bfb565dbba2a75ffa2
Reviewed-by: Laszlo Papp <2164cc32668ec579454611fc5261234262c80421@kde.org>
Reviewed-by: Oswald Buddenhagen <6a8868beda3e139b5ac22b2534a23d3e6ba81819@digia.com>

kobolabs/qtserialport,RoadWorksSoftware/QtSerialPort-OS2,RoadWorksSoftware/QtSerialPort-OS2,kobolabs/qtserialport