Fill in the date of 0.0.7 release in the changelog
Fill in the date of 0.0.7 release in the changelog

[skip ci]
daa84/gtk,Susurrus/gtk,EPashkin/rust-gnome-gtk,daa84/gtk,Susurrus/gtk,rust-gnome/gtk,rust-gnome/gtk,EPashkin/rust-gnome-gtk