bump rack-cors

Gemfile

@@ -50,7 +50,7 @@ gem 'configurate', '0.2.0'
 
 # Cross-origin resource sharing
 
-gem 'rack-cors', '0.2.9', :require => 'rack/cors'
+gem 'rack-cors', '0.3.1', :require => 'rack/cors'
 
 # CSS
 

Gemfile.lock

@@ -440,7 +440,7 @@ GEM
     pry-debundle (0.8)
       pry
     rack (1.6.0)
-    rack-cors (0.2.9)
+    rack-cors (0.3.1)
     rack-google-analytics (1.2.0)
       actionpack
       activesupport
@@ -736,7 +736,7 @@ DEPENDENCIES
   pry
   pry-byebug
   pry-debundle
-  rack-cors (= 0.2.9)
+  rack-cors (= 0.3.1)
   rack-google-analytics (= 1.2.0)
   rack-piwik (= 0.3.0)
   rack-protection (= 1.5.2)