v0.3.5

Changelog:

de79a9c Query gossip messages on every new connection
3fd34ef Register all cranes and stop them explicitly when shutting down
48a44b0 Inherit context less for cleaner shutdown procedure
c9a6622 Disqualify routes with hub re-use
44ddde7 Fix flow queue and terminal flushing
388f730 Remove faulty flush check
423c161 Write all data before closing connecting in connect op
72c109f Add connect op test
3560cc1 Add tunnel context to connection
562d6dc Improve client notification handling
daefc8b Add LimitNOFILE=infinity option to systemd service