Making a minimal comment change to changes.txt in order to commit revision...

Making a minimal comment change to changes.txt in order to commit revision 1800 and spoil Hybrid's Friday afternoon.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1801 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

 Changes in version 1.5 (... 2008)
 
- - Renamed IGUIElement::setRelativePosition(const core::rect<f32>& r) to setRelativePositionProportional(), as it has radically different functionality from setRelativePosition(const core::rect<s32>& r)
+ - Renamed IGUIElement::setRelativePosition(const core::rect<f32>& r) to IGUIElement::setRelativePositionProportional(), as it has radically different functionality from setRelativePosition(const core::rect<s32>& r)
 
  - Added IGUIElement::setRelativePosition(const core::position2di & position) to set a new position while retaining the existing height and width.