document further entropy fixes

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+2009-11-13  Bob Halley  <halley@dnspython.org>
+
+       * dns/entropy.py: Use os.urandom() if present.  Don't seed until
+         someone wants randomness.
+
 2009-09-16  Bob Halley  <halley@dnspython.org>
 
        * dns/entropy.py: The entropy module needs locking in order to be