📝 adding travis-ci badge

Author: carbontwelve

README.md

@@ -1,5 +1,6 @@
 # Tapestry Database Plugin
 
+[![Build Status](https://travis-ci.org/tapestry-cloud/database-plugin.svg?branch=master)](https://travis-ci.org/tapestry-cloud/database-plugin)
 [![Minimum PHP Version](https://img.shields.io/badge/php-%3E%3D%205.6-8892BF.svg?style=flat-square)](https://php.net/)
 [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE)
 [![Gitmoji](https://img.shields.io/badge/gitmoji-%20😜%20😍-FFDD67.svg?style=flat-square)](https://gitmoji.carloscuesta.me)