fix(readme): Add coverage badge
diff --git a/README.md b/README.md
index 950f282..f4a08be 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@
 [![Build Status](https://travis-ci.com/frappe/erpnext.png)](https://travis-ci.com/frappe/erpnext)
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/frappe/erpnext?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) 
 [![Open Source Helpers](https://www.codetriage.com/frappe/erpnext/badges/users.svg)](https://www.codetriage.com/frappe/erpnext)
+[![Coverage Status](https://coveralls.io/repos/github/frappe/erpnext/badge.svg?branch=develop)](https://coveralls.io/github/frappe/erpnext?branch=develop)
 
 [https://erpnext.com](https://erpnext.com)