Set version to 0.3.6

Author: github-actions[bot]

Project.toml

@@ -1,7 +1,7 @@
 name = "PoissonSolvers"
 uuid = "8f9e8900-be71-40de-a258-603fdc860a2d"
 authors = ["Michael Kraus"]
-version = "0.3.5"
+version = "0.3.6"
 
 [deps]
 BSplineKit = "093aae92-e908-43d7-9660-e50ee39d5a0a"