Bump redis-rack from 2.0.3 to 2.0.4
Bump redis-rack from 2.0.3 to 2.0.4

Bumps [redis-rack](http://redis-store.org/redis-rack) from 2.0.3 to 2.0.4.

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
rdunlop/unicycling-rulebook,rdunlop/unicycling-rulebook,rdunlop/unicycling-rulebook,rdunlop/unicycling-rulebook