bump version for new release (#455)

Includes the bug-fix from #453 / #454

Author: baumgold

src/ArrowTypes/Project.toml

@@ -18,7 +18,7 @@
 name = "ArrowTypes"
 uuid = "31f734f8-188a-4ce0-8406-c8a06bd891cd"
 authors = ["quinnj <[email protected]>"]
-version = "2.2.0"
+version = "2.2.1"
 
 [deps]
 Sockets = "6462fe0b-24de-5631-8697-dd941f90decc"