Update status of py3k support.

Author: Fabian Pedregosa

README-py3k.rst

@@ -1,11 +1,24 @@
 Support for Python 3
 ====================
 
-There is experimental support for python 3. To generate python3
-compatible sources, run the 2to3 tool on the sources top directory::
+There is experimental support for python3 in some modules, the status
+of these is:
 
-    2to3 -wn --no-diffs scikits examples
+   svm : OK
+   linear_models : ?
+   cluster : ?
+   covariance : ?
+   grid_search : ?
+   mixture : ?
+   externals.joblib : ?
+   utils.sparsetools : FAILS to compile
 
-To execute some examples and run the test suite You will also need
-some other tools that as of July 2010 only have experimental python3
-support, like scipy and nosetest3.
+To generate python3 compatible sources for selected modules, run the
+2to3 tool on the module::
+
+    2to3 -wn --no-diffs scikits/learn/$module
+
+If you would like to help with porting to python3, please propose
+yourself in the scikit-learn mailing list:
+
+    https://lists.sourceforge.net/lists/listinfo/scikit-learn-general