Merge branch 'feature/sidekiq-dead-count' into 'master'

Collect Sidekiq dead jobs count

Closes #23

See merge request !49
2 jobs for v1.5.0 in 5 minutes and 11 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #1052318
rspec

00:04:22

passed #1052319
rubocop

00:04:20