Merge pull request #101 from Shopify/rafaelfranca-patch-1

`Rails.application.config` is untyped

rbi/annotations/railties.rbi

@@ -26,27 +26,15 @@ module Rails
 end
 
 class Rails::Application < ::Rails::Engine
-  sig { returns(Rails::Application::Configuration) }
+  sig { returns(T.untyped) }
   def config; end
 end
 
-module Rails::Command::Behavior
-  mixes_in_class_methods ::Rails::Command::Behavior::ClassMethods
-end
-
 class Rails::Engine < ::Rails::Railtie
   sig { returns(ActionDispatch::Routing::RouteSet) }
   def routes(&block); end
 end
 
-module Rails::Generators::Migration
-  mixes_in_class_methods ::Rails::Generators::Migration::ClassMethods
-end
-
-module Rails::Initializable
-  mixes_in_class_methods ::Rails::Initializable::ClassMethods
-end
-
 class Rails::Railtie
   sig { params(block: T.proc.bind(Rails::Railtie).void).void }
   def configure(&block); end