v0.6.5

Gtk4 v0.6.5

Diff since v0.6.4

Merged pull requests:

• Add CSS example with individual button styles (#57) (@JeffFessler)

Closed issues:

• Need example of how to set color of an individual widget/button in Gtk4.jl (#56)
• Bug in Filtering of GtkTreeView (#58)
• Bug in Builder (#59)