Merge pull request #3616 from dennisklein/relicense_permission

RELICENSE permission

RELICENSE/dennisklein.md

+# Permission to Relicense under MPLv2 or any other OSI approved license chosen by the current ZeroMQ BDFL
+
+This is a statement by Dennis Klein
+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 "dennisklein", with
+commit author "Dennis Klein <d.klein@gsi.de>", are copyright of Dennis Klein.
+This document hereby grants the libzmq project team to relicense libzmq,
+including all past, present and future contributions of the author listed above.
+
+Dennis Klein
+2019/08/11