Bundle update

[jonallured]

Notable updates include:

• paper_trail went to 8.0, but it looks to be mostly a release that drops support for old things, rather than a release that actually changes much: https://github.com/airblade/paper_trail/blob/master/CHANGELOG.md#800-2017-10-04

• redis went to 4.0, but Bearden doesn't use it directly, it's mostly in there for sidekiq. In any event, looks like the major change is the removal of Redis.connect in favor of Redis.new and dropping older Ruby: https://github.com/redis/redis-rb/blob/master/CHANGELOG.md#40

• sidekiq got a patch bump that locks it down to versions of redis < 5, so looks like they're all good with the new version

[artsy-peril[bot]]

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