Problem: no relicense grant from PNNL

Solution: add the one received by email

B671D81EAD34104986FFE7881B8036371ABEF4AF@EX10MBOX02.pnnl.gov

RELICENSE/pnnl

+# Permission to Relicense under MPLv2 or any other OSI approved license chosen by the current ZeroMQ BDFL
+This is a statement by Pacific Northwest National Laboratory (Battelle Memorial Institute, Pacific Northwest Division)
+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 (at least as permissive as the MPLv2) chosen by the current ZeroMQ
+BDFL (Benevolent Dictator for Life).
+A portion of the commits made by the Github handle "hashstat", with
+commit author "Brandon Carpenter <brandon.carpenter@pnnl.gov>", are copyright of Pacific Northwest National Laboratory (Battelle Memorial Institute, Pacific Northwest Division).
+This document hereby grants the libzmq project team to relicense libzmq,
+including all past, present and future contributions of the author listed above.
+Jereme Haack on behalf of Brandon Carpenter
+2019/02/18