Update Changes file

Mention the behavioral change introduced by the fix for QTBUG-29836.

Task-number: QTBUG-29836
Change-Id: I15ffd32fd5c0d537528f7b1386691103dab371c7
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>

dist/changes-5.1.0

@@ -46,6 +46,13 @@ Third party components
 
  - tryCompare now correctly fails when it only gets two parameters
 
+ - If a QObject has a property and a slot (or invokable method) with the same
+   name, in QML the previous behavior was to let the property obscure the
+   method; from Qt 5.1 things work in the opposite way, that is a property can
+   never obscure a method having the same name. This is especially important
+   for objects having dynamic properties, such as QQmlPropertyMap. This change
+   was a consequence of the fix for QTBUG-29836.
+
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