add "any" relicensing permission

RELICENSE/FrancoFichtner.md

+# Permission to Relicense under MPLv2 or any other OSI approved license chosen by the current ZeroMQ BDFL
+
+This is a statement by Franco Fichtner 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 "fichtner", with
+commit author "Franco Fichtner <franco@lastsummer.de>", are copyright
+of Franco Fichtner.  This document hereby grants the libzmq project
+team to relicense libzmq, including all past, present and future
+contributions of the author listed above.
+
+Franco Fichtner
+2017/03/21