Update Changelog contents

Author: kaisong1990

CHANGELOG.md

@@ -1,10 +1,10 @@
 ## [1.1.13] - 2020-12-04
-* Fix on checking error pointer before assigning to prevent crashes
+* Adding nil check before assigning error when developers try to get account by username from MSALPublicClientApplication, this will help to prevent a crash when passing in nil as error ponter from the API
 
 ## [1.1.12] - 2020-12-02
 * Added cross-cloud B2B support.
 * Fixed logic to handle links that open in new tab for embedded webview.
-* accountForUsername from MSALPublicClientApplication will return nil back when username is nil or empty, error will be provided if a valid error pointer is passed in via this API
+* AccountForUsername from MSALPublicClientApplication will return nil back when username is nil or empty, error will be provided if a valid error pointer is passed in via this API
 * Updated user guide to provide a sample Swift & ObjC code for querying a specific account and return token silently when multiple accounts are present in the cache. 
 * Added client-side fix for the known ADFS PKeyAuth issue. (#1150)