1.2.1 update changelog.

Author: josebarrueta

changelog.md

@@ -1,5 +1,11 @@
 ## Change Log ##
 
+### 1.2.1 ##
+
+This release fixes four bugs. We are adding one more supported grant_type to the AccessTokenController, also enhancing the signature validation of access/refresh tokens and improving error handing when required fields are missing in the token endpoint.  
+
+See [1.2.1 closed bugs](https://github.com/stormpath/stormpath-sdk-java/issues?q=milestone%3A1.2.1+is%3Aclosed)
+
 ### 1.2.0 ##
 
 This release has a number of feature additions and bug fixes. Of note: