Adding coverage status

Author: rodneyosodo

README.md

@@ -4,6 +4,7 @@ The wrapper provides convenient access to the [Sendy Logistics API](https://www.
 ![Testing](https://github.com/0x6f736f646f/sendyit-python/workflows/Testing/badge.svg)
 ![Creating a Release](https://github.com/0x6f736f646f/sendyit-python/workflows/Creating%20a%20Release/badge.svg)
 ![Upload Python Package](https://github.com/0x6f736f646f/sendyit-python/workflows/Upload%20Python%20Package/badge.svg)
+[![Coverage Status](https://coveralls.io/repos/github/0x6f736f646f/sendyit-python/badge.svg?branch=master)](https://coveralls.io/github/0x6f736f646f/sendyit-python?branch=master)
 [![Build Status](https://travis-ci.com/0x6f736f646f/sendyit-python.svg?branch=master)](https://travis-ci.com/0x6f736f646f/sendyit-python)
 [![Maintainability](https://api.codeclimate.com/v1/badges/6c6702b7007a11eb203f/maintainability)](https://codeclimate.com/github/0x6f736f646f/sendyit-python/maintainability)