Update version to 5.5.6

Author: bvdmitri

Project.toml

@@ -1,7 +1,7 @@
 name = "ReactiveMP"
 uuid = "a194aa59-28ba-4574-a09c-4a745416d6e3"
 authors = ["Dmitry Bagaev <[email protected]>", "Albert Podusenko <[email protected]>", "Bart van Erp <[email protected]>", "Ismail Senoz <[email protected]>"]
-version = "5.5.5"
+version = "5.5.6"
 
 [deps]
 BayesBase = "b4ee3484-f114-42fe-b91c-797d54a0c67e"