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allow 1000 bidirectional streams, disable unidirectional streams

generate certificates that are valid for 180 days

obey the multiaddr's IP version

make the gx build work

use a single packet conn for all outgoing connections

use multiaddr.Encapsulate to create QUIC multiaddrs

use the context for dialing

disable source address validation

The certificate chain used for the handshake is relatively small (it
fits in 2 packets). This reduces the risk that an attacker will use
libp2p nodes for reflection attacks.

close and discard a connection if the client's cert chain is invalid

use the new transport interfaces

Fixes #2.

This also requires dropping support for Go 1.8.