Merge pull request #3634 from bluca/relicense

RELICENSE: add grant by Daniel Krikun

RELICENSE/dkrikun.md

+# Permission to Relicense under MPLv2
+
+This is a statement by Daniel Krikun
+that grants permission to relicense its copyrights in the libzmq C++
+library (ZeroMQ) under the Mozilla Public License v2 (MPLv2).
+
+A portion of the commits made by the Github handle "dkrikun", with
+commit author "Daniel Krikun", are copyright of Daniel Krikun .
+This document hereby grants the libzmq project team to relicense libzmq,
+including all past, present and future contributions of the author listed above.
+
+Daniel Krikun
+2019/08/17