Bump the gem version

Kyle d'Oliveira · Kyle d'Oliveira · commit 8bf0411636d5 · 2019-12-18T13:39:18.000-08:00
diff --git a/lib/polymorphic_integer_type/version.rb b/lib/polymorphic_integer_type/version.rb
@@ -1,3 +1,3 @@
 module PolymorphicIntegerType
-  VERSION = "2.2.3"
+  VERSION = "2.2.4"
 end
