BUILD: Release Catlab v0.15.5.

Author: epatters

Project.toml

@@ -2,7 +2,7 @@ name = "Catlab"
 uuid = "134e5e36-593f-5add-ad60-77f754baafbe"
 license = "MIT"
 authors = ["Evan Patterson <evan@epatters.org>"]
-version = "0.15.4"
+version = "0.15.5"
 
 [deps]
 ACSets = "227ef7b5-1206-438b-ac65-934d6da304b8"