[Development] MAINTAINERS, your action needed: Qt 5.9.3 change files

[Jani Heikkinen]

Hi all,

There is still quite many changes files under construction, see https://codereview.qt-project.org/#/q/message:%22file+for+Qt+5.9.3%22,n,z
Please finalize ongoing ones now; we are targeting to get Qt 5.9.3 out during next week so we need to get final content in as soon as possible.

+2 still missing:
- qt/qtlocation
- qt/qtscxml
- qt/qtx11extras
- qt/qt3d
- qt/qtdoc
- qt/qtwebsockets
- qt/qtbase
- qt/qtgraphicaleffects
- qt/qtwebchannel
- qt/qtwebview
- qt/qtwebengine	
- qt/qtwayland
- qt/qtpurchasing
- qt/qtdeclarative

br,
Jani