Merge pull request #5 from fflorent/master

Fix false positive when using chai-as-promised

src/chai-xml.js

@@ -78,7 +78,7 @@ var chaiXmlPlugin = function chaiXmlPlugin(chai, utils){
                     });
                 });
             } else {
-                _super.apply(this, arguments);
+                return _super.apply(this, arguments);
             }
         };
     };