Update Release Notes for 1.6.0
------------------------------
Key: CB-407
URL: https://issues.apache.org/jira/browse/CB-407
Project: Apache Callback
Issue Type: Bug
Components: iOS
Reporter: Shazron Abdullah
Assignee: Shazron Abdullah
Fix For: 1.6.0
Grab changes from 1.6.0rc1 to HEAD
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