go-conntrack
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Travis: install github.com/jpillora/backoff
This dependency was previously missing, causing builds to fail (see https://travis-ci.org/mwitkow/go-conntrack/jobs/559296369#L469 for example).
CI failure possibly introduced by https://github.com/mwitkow/go-conntrack/pull/7 (ping @devnev)
PTAL
This change fixes the Travis CI.
- before: https://travis-ci.org/mwitkow/go-conntrack/jobs/559296369#L469
- after: https://travis-ci.org/mwitkow/go-conntrack/jobs/563129885#L508