Remove deprecation warning

Author: rossta

test/sample/config/environments/test.rb

@@ -36,7 +36,7 @@ def self.proc_method
   config.action_controller.perform_caching = false
 
   # Raise exceptions instead of rendering exception templates.
-  config.action_dispatch.show_exceptions = false
+  config.action_dispatch.show_exceptions = :none
 
   # Disable request forgery protection in test environment.
   config.action_controller.allow_forgery_protection = false