Add changes-5.1.1 file.

Task-number: QTBUG-32808
Change-Id: I998548df399ec6d2dd6b061b5ba2c1ca451276bc
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Merge remote-tracking branch 'origin/release' into stable

Change-Id: Ibcde5cfcb97948f9e3f71a2d6b06397e1003aa3b