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add a bit of guidance with upgrading

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1 parent d90e94d commit d0626222ae1db056daa01f4be16bd486ae4ca805 @ericbmerritt ericbmerritt committed Mar 8, 2012
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+Upgrading From 2.1 to 3.1
+=========================
+
+See the general upgrading guidelines [here](http://www.zeromq.org/docs:3-1-upgrade).
+
+Things to watchout for in erlzmq2
+---------------------------------
+
+The 'timeout' flag has been removed from the send receive flags. In
+3.1 the native zeromq `sndtimeo` and `rcvtimeo` flags where added. You
+should use these instead.
+
+Also, is in zeromq as a whole the hwm flag has been replaced with
+sndhwm and rcvhwm.
+
+Things not to worry about
+-------------------------
+
+The rest of the things in that upgrade guide can be ignored. The
+erlzmq2 nif binding abstracts that away for you.
+

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