TESTED_AGAINST in airbrake-3.1.12 vs TESTED_AGAINST in airbrake-3.1.13

@@ -1,6 +1,7 @@
 Rails 3.0.20
 Rails 3.1.12
 Rails 3.2.13
+Rails 4.0.0
 Sinatra 1.3.3
 Rack 1.4.3
 Rake 10.0.3