Update README for 3.2.

Welcome Mode now also uses the QQuickWidget, so state dependency,
add to windeployqt options.

Change-Id: I3ae7e1db3feeb1e7fd26b6dbd2433d0facab4ff1
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>

README

@@ -10,16 +10,14 @@ Windows XP SP3 or later
 (K)Ubuntu Linux 11.10 (32-bit and 64-bit) or later
 Mac OS X 10.7 or later
 
-Building the sources requires Qt 5.2.0 or later.
+Building the sources requires Qt 5.3.1 or later.
 It is also possible to build with Qt 4.8.x, but in that case the Welcome mode,
 QML Profiler, and the WinRT and Qbs support are disabled.
-The Qt Quick Designer can only be compiled with Qt 5.3.1 or later , because
-it requires QQuickWidget.
 
 Compiling Qt Creator
 ====================
 Prerequisites:
-   * Qt 5.2.0 or later (with restrictions also Qt 4.8.x)
+   * Qt 5.3.1 or later (with restrictions also Qt 4.8.x)
    * On Windows:
      -  ActiveState Active Perl
      -  MinGW or Visual Studio 2010 or later
@@ -191,7 +189,7 @@ http://qt-project.org/wiki/Building_Qt_5_from_Git .
        able to find all dependent Qt-libraries and plugins when being launched by the
        system. The easiest way to provide them for Qt 5 is to run the tool windeployqt:
 
-       windeployqt -svg -xml -designercomponents -script -concurrent -network -quick -test -sql -printsupport -qthelp -qmldir share\qtcreator -qmldir src\plugins\qmlprofiler bin\qtcreator.exe
+       windeployqt -svg -xml -designercomponents -script -concurrent -network -quick -quickwidgets -test -sql -printsupport -qthelp -qmldir share\qtcreator -qmldir src\plugins\qmlprofiler bin\qtcreator.exe
 
 Note that unlike on Unix, you cannot overwrite executables that are running.
 Thus, if you want to work on Qt Creator using Qt Creator, you need a