Deprecation warning in `Sequelize.cls` getter

lib/sequelize.js

@@ -1034,6 +1034,7 @@ class Sequelize {
   }
   }
 
 
   static get cls() {
   static get cls() {
+    Utils.deprecate('Sequelize.cls is deprecated and will be removed in a future version. Keep track of the CLS namespace you use in your own code.');
     return this._cls;
     return this._cls;
   }
   }