Set to Version 0.2.4-dev (#639)

* Set to Version 0.2.4-dev

* Update Project.toml

Author: svchb

Project.toml

@@ -1,7 +1,7 @@
 name = "TrixiParticles"
 uuid = "66699cd8-9c01-4e9d-a059-b96c86d16b3a"
 authors = ["erik.faulhaber <[email protected]>"]
-version = "0.2.3"
+version = "0.2.4-dev"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"