Update getting-started.rst with Python 3 example

docs/getting-started.rst

@@ -147,7 +147,7 @@ The result should look like:
 
 Note the ``value`` in the result (``61626364``); this is the
 hex-encoding of the ASCII of ``abcd``. You can verify this in
-a python shell by running ``"61626364".decode('hex')``. Stay
+a python 2 shell by running ``"61626364".decode('hex')`` or in python 3 shell by running ``import codecs; codecs.decode("61626364", 'hex').decode('ascii')``. Stay
 tuned for a future release that `makes this output more human-readable <https://github.com/tendermint/abci/issues/32>`__.
 
 Now let's try setting a different key and value: