Bump sidekiq-scheduler to 2.1.5

Bumps [sidekiq-scheduler](https://github.com/moove-it/sidekiq-scheduler) from 2.0.8 to 2.1.5.
- [Release notes](https://github.com/moove-it/sidekiq-scheduler/releases/tag/v2.1.5)
- [Commits](sidekiq-scheduler/sidekiq-scheduler@v2.0.8...v2.1.5)

Gemfile.lock

@@ -75,8 +75,8 @@ GEM
       execjs
     coffee-script-source (1.10.0)
     commonjs (0.2.7)
-    concurrent-ruby (1.0.2)
-    connection_pool (2.2.0)
+    concurrent-ruby (1.0.5)
+    connection_pool (2.2.1)
     coveralls (0.8.15)
       json (>= 1.8, < 3)
       simplecov (~> 0.12.0)
@@ -116,6 +116,8 @@ GEM
       launchy (~> 2.1)
       mail (~> 2.6.3)
     erubis (2.7.0)
+    et-orbi (1.0.4)
+      tzinfo
     execjs (2.7.0)
     ffi (1.9.14)
     gherkin (4.0.0)
@@ -176,7 +178,7 @@ GEM
     puma (3.6.0)
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
-    rack (1.6.4)
+    rack (1.6.8)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)
@@ -217,7 +219,7 @@ GEM
     rainbow (2.1.0)
     rake (11.2.2)
     redcarpet (3.3.4)
-    redis (3.3.1)
+    redis (3.3.3)
     ref (2.0.0)
     require_all (1.3.3)
     responders (2.2.0)
@@ -247,7 +249,8 @@ GEM
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.8.1)
     rubyzip (1.2.0)
-    rufus-scheduler (3.1.10)
+    rufus-scheduler (3.4.2)
+      et-orbi (~> 1.0)
     safe_yaml (1.0.4)
     selenium-webdriver (2.53.4)
       childprocess (~> 0.5)
@@ -256,15 +259,14 @@ GEM
     sexp_processor (4.7.0)
     shoulda-matchers (3.1.1)
       activesupport (>= 4.0.0)
-    sidekiq (4.1.4)
+    sidekiq (5.0.0)
       concurrent-ruby (~> 1.0)
       connection_pool (~> 2.2, >= 2.2.0)
-      redis (~> 3.2, >= 3.2.1)
-      sinatra (>= 1.4.7)
-    sidekiq-scheduler (2.0.8)
-      multi_json (~> 1)
+      rack-protection (>= 1.5.0)
+      redis (~> 3.3, >= 3.3.3)
+    sidekiq-scheduler (2.1.5)
       redis (~> 3)
-      rufus-scheduler (~> 3.1.8)
+      rufus-scheduler (~> 3.2)
       sidekiq (>= 3)
       tilt (>= 1.4.0)
     sidekiq-unique-jobs (4.0.18)
@@ -275,7 +277,7 @@ GEM
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.0)
-    sinatra (1.4.7)
+    sinatra (1.4.8)
       rack (~> 1.5)
       rack-protection (~> 1.4)
       tilt (>= 1.3, < 3)
@@ -301,7 +303,7 @@ GEM
       ref
     thor (0.19.1)
     thread_safe (0.3.5)
-    tilt (2.0.5)
+    tilt (2.0.7)
     timecop (0.8.1)
     tins (1.12.0)
     turbolinks (5.0.1)