Upgrade dependencies

vendor/git.autistici.org/ai3/go-common/clientutil/dns.go

vendor/git.autistici.org/ai3/go-common/clientutil/watcher.go

vendor/git.autistici.org/ai3/go-common/serverutil/http.go

vendor/git.autistici.org/ai3/go-common/serverutil/tls.go

vendor/git.autistici.org/id/auth/README.md

vendor/github.com/beorn7/perks/quantile/stream.go

vendor/github.com/coreos/go-systemd/NOTICE

vendor/github.com/coreos/go-systemd/daemon/sdnotify.go

vendor/github.com/coreos/go-systemd/daemon/watchdog.go

vendor/github.com/gogo/protobuf/LICENSE

vendor/github.com/gogo/protobuf/proto/Makefile

vendor/github.com/gogo/protobuf/proto/clone.go

vendor/github.com/gogo/protobuf/proto/custom_gogo.go

vendor/github.com/gogo/protobuf/proto/decode.go

vendor/github.com/gogo/protobuf/proto/discard.go

vendor/github.com/gogo/protobuf/proto/duration.go

vendor/github.com/gogo/protobuf/proto/duration_gogo.go

vendor/github.com/gogo/protobuf/proto/encode.go

vendor/github.com/gogo/protobuf/proto/encode_gogo.go

vendor/github.com/gogo/protobuf/proto/equal.go