Merge pull request #2566 from leonarf/leonarf-relicense

license right grant from Leonard Michelet

RELICENSE/LeonardMichelet

+Permission to Relicense under MPLv2 or any other OSI approved license chosen by the current ZeroMQ BDFL
+
+This is a statement by Léonard Michelet
+that grants permission to relicense its copyrights in the libzmq C++
+library (ZeroMQ) under the Mozilla Public License v2 (MPLv2) or any other
+Open Source Initiative approved license chosen by the current
+ZeroMQ BDFL (Benevolent Dictator for Life).
+
+A portion of the commits made by the Github handle "leonarf", with
+commit author "Andre Caron andre.l.caron@gmail.com", are copyright of Léonard Michelet.
+This document hereby grants the libzmq project team to relicense libzmq,
+including all past, present and future contributions of the author listed above.
+
+Michelet Léonard 2017/03/29