Merge pull request #3685 from trya/relicensing

Add relicense grant

RELICENSE/trya.md

+# Permission to Relicense under MPLv2
+
+This is a statement by trya.
+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 "trya", with
+commit author "trya", are copyright of trya.
+This document hereby grants the libzmq project team to relicense libzmq, 
+including all past, present and future contributions of the author listed above.
+
+trya
+2019/09/23