chore(doc): add renovate badge

♥ renovate

Author: ultrox

README.md

@@ -2,6 +2,10 @@
 [![version](https://img.shields.io/npm/v/@ma.vu/pkginfo.svg?style=flat-square)](http://npm.im/@ma.vu/pkginfo)
 [![MIT License](https://img.shields.io/npm/l/pkginfo.svg?style=flat-square)](http://opensource.org/licenses/MIT)
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg?style=flat-square)](https://github.com/semantic-release/semantic-release)
+[![Renovate - Always up to date][renovateapp-svg]][renovateapp-link]
+
+[renovateapp-link]: https://renovateapp.com
+[renovateapp-svg]: https://img.shields.io/badge/always-up_to_date-brightgreen.svg
 
 ## Install