Updated the changelog for 1.3.0 release.

Author: alda-optimizely

CHANGELOG.md

@@ -1,3 +1,33 @@
+## 1.3.0
+- Added the forced bucketing feature allows customers to force users into variations in real time for QA purposes without requiring datafile downloads from the network. The following APIs are introduced:
+```
+/**
+* Force a user into a variation for a given experiment.
+*
+* @param $experimentKey string Key identifying the experiment.
+* @param $userId string The user ID to be used for bucketing. 
+* @param $variationKey string The variation key specifies the variation which the user  
+* will be forced into. If null, then clear the existing experiment-to-variation mapping.
+*
+* @return boolean A boolean value that indicates if the set completed successfully. 
+*/
+```
+```
+public function setForcedVariation($experimentKey, $userId, $variationKey);
+
+/**
+* Gets the forced variation for a given user and experiment.
+*
+* @param $experimentKey string Key identifying the experiment.
+* @param $userId string The user ID to be used for bucketing. 
+*
+* @return string|null The forced variation key.
+*/
+public function getForcedVariation($experimentKey, $userId);
+```
+
+- Added the bucketing ID feature allows decoupling bucketing from user identification so that a group of users that have the same bucketing ID are put into the same variation. 
+
 ## 1.2.0
 - Add user profile service.