Update readme

eight04 · eight04 · commit 31fac6c05b91 · 2016-03-31T02:41:25.000+08:00
diff --git a/README.md b/README.md
@@ -106,6 +106,8 @@ Todos
 
 Changelog
 ---------
+* 2.2.1 (Mar 31, 2016)
+	- Fix reference error with "Z" token. See [#20](https://github.com/eight04/angular-datetime/pull/20)
 * 2.2.0 (Feb 23, 2016)
 	- Add new error type "LEADING_ZERO", "NUMBER_TOOSMALL".
 	- Use the behavior introduced in #18.
