Mention also QML codemodel fix in changes-2.8.1 file

Change-Id: I94c6a92cd27b6c0bd818b9d82240b20875909f07
Reviewed-by: hjk <hjk121@nokiamail.com>

dist/changes-2.8.1

@@ -8,7 +8,7 @@ you can check out from the public Git repository. For example:
 git clone git://gitorious.org/qt-creator/qt-creator.git
 git log --cherry-pick --pretty=oneline v2.8.0..v2.8.1
 
-There is a total of 129 changes by 28 individual contributors.
+There is a total of 132 changes by 28 individual contributors.
 
 Credits for these changes go to:
 
@@ -96,6 +96,9 @@ C++ Support
    * Added checking whether project has changed before reparsing
      (QTCREATORBUG-9581)
 
+QML Support
+   * Add vector*d, quaternion, and matrix4x4 types to code model
+
 Python Support
 
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