Upate QT framework's URL to readme.

Author: kimmov

readme_gui.txt

@@ -7,15 +7,15 @@ Running
 -------
 You need QT4 libraries installed in your system. Packages/files to install
 depends on your operating system:
-- Windows download QT4 from http://www.qtsoftware.com
-- Linux install QT4 using your package manager, look for packages having QT4
+- Windows: download QT4 from http://qt.nokia.com/
+- Linux: install QT4 using your package manager, look for packages having QT4
   in their name, e.g. for Ubuntu install libqt4-core, libqt4-gui and libqt4-xml
 
 Compiling
 ---------
 Windows:
-- The easy way is to download Qt SDK from http://www.qtsoftware.com and use
-  Qt Creator and/or command line tools to build the GUI.
+- The easy way is to download Qt SDK from http://qt.nokia.com/ and use Qt
+  Creator and/or command line tools to build the GUI.
 - The harder way is to download QT sources and build QT with Visual Studio
   (Express Edition works). Compiling QT alone may take over 4 hours!