[Development] Branching '5.9.4' from '5.9' started

[Jani Heikkinen]

Hi all,

We have now soft branched '5.9.4' from '5.9' so please start using '5.9.4' for new changes targeting Qt 5.9.4 release. Target is to do final downmerge from '5.9' -> '5.9.4' and finalize branching at the beginning of January 2018 so there should be enough time to finalize ongoing ones in '5.9'. Target is to release Qt 5.9.4 ~ mid January.

br,
Jani Heikkinen
Release Manager