[Development] Maintainers for Qt Charts and Data Visualization

[Lars Knoll]

Hi,

Since we now open sourced Charts and Data Visualisation for Qt 5.7, the modules also need a Maintainer. I'd like to propose the two people that have been maintaining these modules while they were developed inside TQtC to continue in this role: Miikka Heikkinen for Charts, and Tomi Korpipää for Data Visualisation.

Cheers,
Lars