Bump sidekiq from 2.7.5 to 5.2.0

Gemfile.lock

@@ -49,9 +49,6 @@ GEM
     carrierwave (0.8.0)
       activemodel (>= 3.2.0)
       activesupport (>= 3.2.0)
-    celluloid (0.12.4)
-      facter (>= 1.6.12)
-      timers (>= 1.0.0)
     childprocess (0.3.8)
       ffi (~> 1.0, >= 1.0.11)
     coderay (1.0.9)
@@ -62,13 +59,12 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.5.0)
-    connection_pool (1.0.0)
+    connection_pool (2.2.5)
     diff-lcs (1.1.3)
     erubis (2.7.0)
     excon (0.13.4)
     execjs (1.4.0)
       multi_json (~> 1.0)
-    facter (1.6.17)
     factory_girl (2.3.2)
       activesupport
     factory_girl_rails (1.4.0)
@@ -115,7 +111,7 @@ GEM
       treetop (~> 1.4.8)
     method_source (0.8.1)
     mime-types (1.21)
-    multi_json (1.6.1)
+    multi_json (1.15.0)
     net-scp (1.0.4)
       net-ssh (>= 1.99.1)
     net-ssh (2.6.5)
@@ -126,10 +122,10 @@ GEM
       coderay (~> 1.0.5)
       method_source (~> 0.8)
       slop (~> 3.4)
-    rack (1.4.5)
+    rack (1.4.7)
     rack-cache (1.2)
       rack (>= 0.4)
-    rack-protection (1.3.2)
+    rack-protection (1.5.5)
       rack
     rack-ssl (1.3.3)
       rack
@@ -154,9 +150,7 @@ GEM
     rb-fsevent (0.4.3.1)
     rdoc (3.12.2)
       json (~> 1.4)
-    redis (3.0.2)
-    redis-namespace (1.2.1)
-      redis (~> 3.0.0)
+    redis (4.4.0)
     rspec (2.10.0)
       rspec-core (~> 2.10.0)
       rspec-expectations (~> 2.10.0)
@@ -182,12 +176,10 @@ GEM
       multi_json (~> 1.0)
       rubyzip
       websocket (~> 1.0.4)
-    sidekiq (2.7.5)
-      celluloid (~> 0.12.0)
-      connection_pool (~> 1.0)
-      multi_json (~> 1)
-      redis (~> 3)
-      redis-namespace
+    sidekiq (5.2.0)
+      connection_pool (~> 2.2, >= 2.2.2)
+      rack-protection (>= 1.5.0)
+      redis (>= 3.3.5, < 5)
     sinatra (1.3.5)
       rack (~> 1.4)
       rack-protection (~> 1.3)
@@ -206,7 +198,6 @@ GEM
     terminal-table (1.4.5)
     thor (0.14.6)
     tilt (1.3.4)
-    timers (1.1.0)
     treetop (1.4.12)
       polyglot
       polyglot (>= 0.3.1)