最低版本支持到Node 6.0

.travis.yml

@@ -1,6 +1,5 @@
 language: node_js
 node_js:
-  - 4.0
   - 6.0
   - 7.0
   - 8.0

README.md

@@ -14,7 +14,7 @@
 [coveralls-url]: https://coveralls.io/r/leizongmin/leizm-sql?branch=master
 [david-image]: https://img.shields.io/david/leizongmin/leizm-sql.svg?style=flat-square
 [david-url]: https://david-dm.org/leizongmin/leizm-sql
-[node-image]: https://img.shields.io/badge/node.js-%3E=_4.0-green.svg?style=flat-square
+[node-image]: https://img.shields.io/badge/node.js-%3E=_6.0-green.svg?style=flat-square
 [node-url]: http://nodejs.org/download/
 [download-image]: https://img.shields.io/npm/dm/@leizm/sql.svg?style=flat-square
 [download-url]: https://npmjs.org/package/@leizm/sql