Update README wrt. reference plugin configuration
Update README wrt. reference plugin configuration

RevBy: Michael Hasselmann, Jon Nordby
Maliit-keyboard has now different .so name and subview should not
be empty. Instead it should be a language like "de" or "en_gb".

maliit/plugins,develersrl/maliit-demo-qml,maliit/plugins,KDE/plasma-maliit-plugins,RHawkeyed/plugins,develersrl/maliit-demo-qml,KDE/plasma-maliit-plugins,maliit/plugins,KDE/plasma-maliit-plugins,KDE/plasma-maliit-plugins,RHawkeyed/plugins,RHawkeyed/plugins,develersrl/maliit-demo-qml,develersrl/maliit-demo-qml,RHawkeyed/plugins,maliit/plugins,RHawkeyed/plugins