fixed changelog

changelog.md

 # Laravel Change Log
 
-## Version 1.6.0
+## Version 1.5.2
 
 - Moved **system/db/manager.php** to **system/db.php**. Updated alias appropriately.
 - Unspecified optional parameters will be removed from URLs generated using route names.
 - Fixed bug in Config::set that prevented it from digging deep into arrays.
 - Replace Crypt class with Crypter class. Ditched static methods for better architecture.
-- Re-wrote exception handling classes for better architecture and design.
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+- Re-wrote exception handling classes for better architecture and design.
+
+### Upgrading From 1.5.1
+
+- Replace the **system** directory.
+- Replace the **application/config/aliases.php** file.
+- Take note of encryption class changes.
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