Bump sidekiq from 5.0.5 to 5.1.0

Bumps [sidekiq](https://github.com/mperham/sidekiq) from 5.0.5 to 5.1.0.
- [Changelog](https://github.com/mperham/sidekiq/blob/master/Changes.md)
- [Commits](sidekiq/sidekiq@v5.0.5...v5.1.0)

Gemfile.lock

@@ -321,7 +321,7 @@ GEM
       rubyzip (~> 1.0)
     shoulda-matchers (3.1.2)
       activesupport (>= 4.0.0)
-    sidekiq (5.0.5)
+    sidekiq (5.1.0)
       concurrent-ruby (~> 1.0)
       connection_pool (~> 2.2, >= 2.2.0)
       rack-protection (>= 1.5.0)