Qt version requirement in KF 5.13

[David Faure]

I would like to bump the Qt version requirement from Qt 5.2 to Qt 5.3 in the next KF5 release.
Any objections?

This is mostly prompted by the problems with building Qt 5.2.1 on the CI system (looks like
glib broke SC somewhere?), and by the fact that Qt 5.3 was released more than a year ago.

-- 
David Faure, faure at kde.org, http://www.davidfaure.fr
Working on KDE Frameworks 5