Update readme description

Author: jedymatt

README.md

@@ -5,6 +5,7 @@
 [![PyPI - License](https://img.shields.io/pypi/l/sqlalchemyseed)](https://github.com/jedymatt/sqlalchemyseed/blob/main/LICENSE)
 [![Build Status](https://app.travis-ci.com/jedymatt/sqlalchemyseed.svg?branch=main)](https://app.travis-ci.com/jedymatt/sqlalchemyseed)
 [![Maintainability](https://api.codeclimate.com/v1/badges/a380a2c1a63bc91742d9/maintainability)](https://codeclimate.com/github/jedymatt/sqlalchemyseed/maintainability)
+[![Test Coverage](https://api.codeclimate.com/v1/badges/a380a2c1a63bc91742d9/test_coverage)](https://codeclimate.com/github/jedymatt/sqlalchemyseed/test_coverage)
 [![codecov](https://codecov.io/gh/jedymatt/sqlalchemyseed/branch/main/graph/badge.svg?token=W03MFZ2FAG)](https://codecov.io/gh/jedymatt/sqlalchemyseed)
 
 Sqlalchemy seeder that supports nested relationships.