add a warning about bgen being removed
diff --git a/Tools/bgen/README b/Tools/bgen/README
index 70700c6..3cf9069 100644
--- a/Tools/bgen/README
+++ b/Tools/bgen/README
@@ -5,3 +5,5 @@
 complete source code for Python extension module.  For examples of its
 use, see the Mac Python source distribution (available separately
 from the Python ftp archives).  Note that BGEN is not Mac specific!
+
+WARNING: bgen has been removed in 3.0.