Updated changelog

Documentation/DeveloperHelpSources/changelog.docu

@@ -21,9 +21,11 @@
             - Bounding box diagonal and boundary length where exchanged in the toolbox table 
          - Primitives
             - Added Torus
+            - Added Hexahedral cube
          - PropertyViz
             - Support Build without OVM (Thanks to Matthias Moeller for the patch)
             - Added normalized checkbox to vizualize vectors as colors
+            - Fixed a typo 
          - SelectionBase
             - added signal and slot to add widgets for selectionParameters to the selectioninterface
          - Type OpenVolumemesh