Bump version to 4.2.2

CHANGELOG

@@ -1,3 +1,7 @@
+== Version 4.2.2
+
+* Support for AccessToken#delegate endpoint
+
 == Version 4.2.1
 
 * Support for Users and Discounts (Shopify Plus only)

lib/shopify_api/version.rb

@@ -1,3 +1,3 @@
 module ShopifyAPI
-  VERSION = "4.2.1"
+  VERSION = "4.2.2"
 end