updated upgrade info [skip ci]

framework/CHANGELOG.md

@@ -71,13 +71,13 @@ Yii Framework 2 Change Log
 - Chg #3175: InvalidCallException, InvalidParamException, UnknownMethodException are now extended from SPL BadMethodCallException (samdark)
 - Chg #3383: Added `$type` parameter to `IdentityInterface::findIdentityByAccessToken()` (qiangxue)
 - Chg #3531: \yii\grid\GridView now allows any character (except ":") in the attribute part of the shorthand syntax for columns (rawtaz)
+- Chg #3544: Added `$key` as a parameter to the callable specified via `yii\grid\DataColumn::value` (mdmunir)
 - Chg: Replaced `clearAll()` and `clearAllAssignments()` in `yii\rbac\ManagerInterface` with `removeAll()`, `removeAllRoles()`, `removeAllPermissions()`, `removeAllRules()` and `removeAllAssignments()` (qiangxue)
 - Chg: Added `$user` as the first parameter of `yii\rbac\Rule::execute()` (qiangxue)
 - Chg: `yii\grid\DataColumn::getDataCellValue()` visibility is now `public` to allow accessing the value from a GridView directly (cebe)
 - Chg: `yii\data\ActiveDataProvider::$query` will not be modified directly with pagination and sorting anymore so it will be reuseable (cebe)
 - Chg: Removed `yii\rest\ActiveController::$transactional` property and connected functionality (samdark)
 - Chg: Changed the default value of the `keyPrefix` property of cache components to be null (qiangxue)
-- Chg #3544: Added `$key` as parameter of `yii\grid\DataColumn::value` (mdmunir)
 
 2.0.0-beta April 13, 2014
 -------------------------

framework/UPGRADE.md

@@ -37,3 +37,8 @@ Upgrade from Yii 2.0 Beta
 * If you are using `dropDownList()`, `listBox()`, `activeDropDownList()`, or `activeListBox()`
   of `yii\helpers\Html`, and your list options use multiple blank spaces to format and align
   option label texts, you need to specify the option `encodeSpaces` to be true.
+
+* If you are using `yii\grid\GridView` and have configured a data column to use a PHP callable
+  to return cell values (via `yii\grid\DataColumn::value`), you may need to adjust the signature
+  of the callable to be `function ($model, $key, $index, $widget)`. The `$key` parameter was newly added
+  in this release.