Bump version to 0.8.8 (#141)

* Fix for setting selected and expanded state of QTreeWidgetItems (#139)

Author: berendkleinhaneveld

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "collagraph"
-version = "0.8.7"
+version = "0.8.8"
 description = "Reactive user interfaces"
 authors = [
     { name = "Berend Klein Haneveld", email = "berendkleinhaneveld@gmail.com" },