Set version to 0.15.2

Author: github-actions[bot]

Project.toml

@@ -1,7 +1,7 @@
 name = "MultiScaleTreeGraph"
 uuid = "dd4a991b-8a45-4075-bede-262ee62d5583"
 authors = ["remi.vezy <VEZY@users.noreply.github.com> and contributors"]
-version = "0.15.1"
+version = "0.15.2"
 
 [deps]
 AbstractTrees = "1520ce14-60c1-5f80-bbc7-55ef81b5835c"