reduce the enforced cmake version to 3.0, in order to support building on debian Jessie
reduce the enforced cmake version to 3.0, in order to support building on debian Jessie

gbaty/pyside2,qtproject/pyside-pyside,qtproject/pyside-pyside,qtproject/pyside-pyside,qtproject/pyside-pyside,BadSingleton/pyside2,BadSingleton/pyside2,gbaty/pyside2,IronManMark20/pyside2,IronManMark20/pyside2,IronManMark20/pyside2,gbaty/pyside2,IronManMark20/pyside2,gbaty/pyside2,BadSingleton/pyside2,BadSingleton/pyside2,IronManMark20/pyside2,qtproject/pyside-pyside,BadSingleton/pyside2,gbaty/pyside2