Update changelog.

Signed-off-by: crynobone <crynobone@gmail.com>

docs/changes.md

@@ -8,6 +8,16 @@ title: Model Change Log
 ### v2.1.0 {#v2-1-0}
 
 * Add support for Laravel 4.1 and Orchestra Platform 2.1.
+* Implement [PSR-2](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md) coding standard.
+* Implement `Orchestra\Notifier\RecipientInterface`.
+* Abstract `Orchestra\Model\Memory\UserMetaRepository` and `Orchestra\Model\Memory\UserMetaProvider` from orchestra/foundation which allow it to be used outside of Orchestra Platform.
+* Add multiple helpers method to `Orchestra\Model\User`:
+  - `attachRole()` 
+  - `detachRole()`
+  - `is()`
+  - `isAny()`
+  - `isNot()`
+  - `isNotAny()`
 
 ## Version 2.0 {#v2-0}