* **render:** ubtitle in side bar shows undefined, fixed [#182](https://github.com/QingWei-Li/docsify/issues/182) ([d087d57](https://github.com/QingWei-Li/docsify/commit/d087d57))
* **render:**subtitle in side bar shows undefined, fixed [#182](https://github.com/QingWei-Li/docsify/issues/182) ([d087d57](https://github.com/QingWei-Li/docsify/commit/d087d57))