Rakefile in appsignal-2.4.0 vs Rakefile in appsignal-2.4.1

- old
+ new

@@ -15,9 +15,10 @@
   sequel
   sequel-435
   sinatra
   grape
   webmachine
+  que
 ).freeze
 
 RUBY_VERSIONS = %w(
   2.0.0-p648
   2.1.8