v0.2.1 - updates to decoding of Turris messages, relink against Zmq 4.3.5

Small, type-related updates to the handling of incoming Turris update protocol messages and how they're being decoded.

UPDATE: Built an updated binary against ZeroMQ 4.3.5

v0.1

Initial release; supports blacklisting and whitelisting IPs via firewalld, based on real-time updates from the Turris Sentinel project by CZ.NIC.