Update version info to 2.6 and mention experimental 3.x branch.x

README.txt

@@ -18,14 +18,9 @@ For full details, see the installation section of the manual.  The basic parts
 of IPython only need the Python standard library, but much of its more advanced
 functionality requires extra packages.
 
-Officially, IPython requires Python version 2.5 or 2.6.  We have *not* yet
-started to port IPython to Python 3.0.
-
-.. warning::
-
-    IPython 0.10 has only been well tested with Python 2.5 and 2.6.  Parts of
-    it may work with Python 2.4, but we do not officially support Python 2.4
-    anymore.  If you need to use 2.4, you can still run IPython 0.9.
+Officially, IPython requires Python version 2.6 or 2.7.  An experimental port
+of IPython to Python 3.x has been sarted, and is available at
+http://github.com/takowl/ipython/tree/ipython-py3k.
 
 
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