Merge pull request #2417 from c-rack/relicense-c-rack

RELICENSE: Constantin Rack

RELICENSE/c-rack.md

+# Permission to Relicense under MPLv2 or any other OSI approved license chosen by the current ZeroMQ BDFL
+
+This is a statement by Constantin Rack
+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 "c-rack", with
+commit author "Constantin Rack <constantin.rack@gmail.com>", are copyright of Constantin Rack.
+This document hereby grants the libzmq project team to relicense libzmq,
+including all past, present and future contributions of the author listed above.
+
+Constantin Rack
+2017/03/20