Clarify changes.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@5244 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

@@ -2,6 +2,7 @@
 Changes in 1.9 (not yet released)
 
 - Randomizer now returns range 0..randMax as documented and no longer 1..randMax as it did before. randMax got reduced by 1.
+  Note: You will generally get different numbers than before! If you need the exact old calculations, please check the corresponding sources in Irrlicht 1.8 in os.cpp/.h
 - Resetting Randomizer with 0 or no longer breaks it (will be set to 1). Same for other numbers for which it wasn't defined.
 - Add SMaterialLayer::TextureWrapW for cubemap texture wrap mode at W axis.
 - Add cubemap texture support for D3D9 and OpenGL drivers.