update sidekiq

Gemfile.lock

@@ -137,7 +137,7 @@ GEM
     eventmachine (1.0.0)
     execjs (1.4.0)
       multi_json (~> 1.0)
-    facter (1.6.17)
+    facter (1.6.18)
     factory_girl (4.1.0)
       activesupport (>= 3.0.0)
     factory_girl_rails (4.1.0)
@@ -257,7 +257,7 @@ GEM
     mime-types (1.21)
     modernizr (2.6.2)
       sprockets (~> 2.0)
-    multi_json (1.7.1)
+    multi_json (1.7.2)
     multi_xml (0.5.3)
     multipart-post (1.1.5)
     mustache (0.99.4)
@@ -357,7 +357,7 @@ GEM
     rdoc (3.12.2)
       json (~> 1.4)
     redcarpet (2.2.2)
-    redis (3.0.2)
+    redis (3.0.3)
     redis-actionpack (3.2.3)
       actionpack (~> 3.2.3)
       redis-rack (~> 1.4.0)
@@ -421,7 +421,7 @@ GEM
     sexp_processor (4.1.3)
     shoulda-matchers (1.3.0)
       activesupport (>= 3.0.0)
-    sidekiq (2.7.5)
+    sidekiq (2.8.0)
       celluloid (~> 0.12.0)
       connection_pool (~> 1.0)
       multi_json (~> 1)