CHANGELOG.md in grape-batch-2.2.1 vs CHANGELOG.md in grape-batch-2.2.2

@@ -1,4 +1,7 @@
+# 2.2.2 (22nd March 2016)
+* SESSION_HEADER is no longer duplicated because when the header contains an ActiveRecord object or something similar, it changes the object id
+
 # 2.2.1 (11th January 2016)
 * Fix main module NameError
 
 # 2.2.0 (11th January 2016)
 * Added authentication during request batch