mention wxGTK changes since 2.8.5

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@48788 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -105,6 +105,15 @@ wxMSW:
 
 - Fixed a bug with a spurious border appearing on wxStatusBar under Windows XP/Vista.
 
+wxGTK:
+- Fixed wxSpinCtrl problem not reporting the correct value
+  after calling SetValue()
+- Fixed problem with key events sometimes being sent to
+  parent window. This also solves a problem with being able
+  to change the selection of a wxListCtrl while editing a
+  label.
+- Correct context menu event coming from wxListCtrl to 
+  have the right ID (not that from the client window).
 
 2.8.5
 -----