fix typo if statement

lib/model.js

@@ -143,7 +143,7 @@ module.exports = (function() {
       if (this.options.updatedAt !== false) {
         this._timestampAttributes.updatedAt = this.options.updatedAt || Utils._.underscoredIf('updatedAt', this.options.underscored);
       }
-      if (this.options.paranoid !== false && this.options.deletedAt) {
+      if (this.options.paranoid && this.options.deletedAt !== false) {
         this._timestampAttributes.deletedAt = this.options.deletedAt || Utils._.underscoredIf('deletedAt', this.options.underscored);
       }
     }