Update gem dependencies

Gemfile.lock

@@ -12,7 +12,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.3.0)
-    concurrent-ruby (1.0.2)
+    concurrent-ruby (1.0.5)
     connection_pool (2.2.0)
     diff-lcs (1.2.5)
     parser (2.3.1.2)
@@ -20,12 +20,12 @@ GEM
     pg (0.18.4)
     powerpack (0.1.1)
     quantile (0.2.0)
-    rack (1.6.4)
+    rack (1.6.8)
     rack-protection (1.5.3)
       rack
     rainbow (2.1.0)
-    redis (3.3.1)
-    redis-namespace (1.5.2)
+    redis (3.3.3)
+    redis-namespace (1.5.3)
       redis (~> 3.0, >= 3.0.4)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)
@@ -47,16 +47,16 @@ GEM
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.8.1)
-    sidekiq (4.2.3)
+    sidekiq (4.2.10)
       concurrent-ruby (~> 1.0)
       connection_pool (~> 2.2, >= 2.2.0)
       rack-protection (>= 1.5.0)
       redis (~> 3.2, >= 3.2.1)
-    sinatra (1.4.7)
+    sinatra (1.4.8)
       rack (~> 1.5)
       rack-protection (~> 1.4)
       tilt (>= 1.3, < 3)
-    tilt (2.0.5)
+    tilt (2.0.7)
     unicode-display_width (1.1.0)
 
 PLATFORMS