Update PEP 3134 to reflect its partial implementation.

pep-3134.txt

@@ -483,6 +483,12 @@ Possible Future Incompatible Changes
       argument instead of the type, value, and traceback arguments.
 
 
+Implementation
+
+    The __traceback__ and __cause__ attributes and the new raise syntax were
+    implemented in revision 57783 [14].
+
+
 Acknowledgements
 
     Brett Cannon, Greg Ewing, Guido van Rossum, Jeremy Hylton, Phillip
@@ -530,6 +536,9 @@ References
    [13] Adam Olsen suggests using a weakref from stack frame to exception
         http://mail.python.org/pipermail/python-3000/2007-January/005363.html
 
+   [14] Patch to implement the bulk of the PEP
+        http://svn.python.org/view/python/branches/py3k/Include/?rev=57783&view=rev
+
 
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