[Development] Maintainers, your action needed: Qt 5.12.2 changes files

[Jani Heikkinen]

Hi,
Initial ones here: https://codereview.qt-project.org/#/q/message:%22Add+changes+file+for+Qt+5.12.2%22,n,z

Please take it over, do needed modifications and get '+2' during this week.

br,
Jani Heikkinen
Release Manager