[Development] Qt 5.13.0 schedule proposal

[Jani Heikkinen]

Hi,

Now when Qt 5.12.0 is almost ready it is time to agree initial schedule for Qt 5.13.0 release. 

There isn't any indication that we could cut the schedule so based on Qt 5.11 and Qt 5.12 ones my proposal for initial Qt 5.13.0 schedule is:

- 25.01.2019: Soft branching from 'dev' to '5.13' start
- 01.02.2019: Feature Freeze & Finalize branching from 'dev' to '5.13'
- 12.02.2019: Alpha release 
- 26.02.2019: Beta1 release
- 07.05.2019: RC 
- 21.05.2019: Qt 5.13.0 Final Release

And as earlier we will produce additional Beta n releases ~(bi)weekly between beta1 and RC.

Any thoughts?

br,
Jani Heikkinen
Release Manager