tweak expected whitespace in integration test

spec/integration/rails_integration_spec.rb

@@ -60,7 +60,7 @@ end
         
         if base_version == "2.3"
           # for some reason timestamps are not required in Rails 2.3.14
-          expected_model.gsub!("datetime         not null", "datetime")
+          expected_model.gsub!(/datetime +not null/, "datetime")
         end
         File.read("app/models/task.rb").should == expected_model