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This happens all the time in tests where we intentionally use fake keys for
performance.

Anyways, users probably don't want their logs spammed with errors they can't do
anything about.

Add a draft write-up for the release

check for connectedness using Connectedness

improve error message in libp2p reflection-based transport option

function cannot be formatted as string

(counting open connections requires copying)

Add test which demonstrates how Mocknet latency works

add a link to options.go in the host example

so reader can see all the supported configuration for the
host constructor

update README of the host example

fixes #333

refactor for transport changes

Also, make the libp2p constructor fully useful. There should now be no need to
manually construct a swarm/host.

gx publish 5.0.21

gx publish 5.0.20

Gx/update yulghf

gx publish 5.0.18

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

gx: update go-multistream

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

Remove go-metrics from package.json

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

misc: downgrade a warning to info