Fix MIT LICENSE Badge

Author: crweiner

README.md

@@ -6,7 +6,7 @@
 [![Twitter Follow](https://img.shields.io/twitter/follow/sendgrid.svg?style=social&label=Follow)](https://twitter.com/sendgrid)
 [![GitHub contributors](https://img.shields.io/github/contributors/sendgrid/sendgrid-java.svg)](https://github.com/sendgrid/sendgrid-java/graphs/contributors)
 [![Open Source Helpers](https://www.codetriage.com/sendgrid/sendgrid-java/badges/users.svg)](https://www.codetriage.com/sendgrid/sendgrid-java)
-[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE.txt)
+[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE.md)
 
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