Update README.md

Author: pateash

README.md

@@ -5,6 +5,7 @@ CLI for Developers
 [![GithubCI](https://github.com/codingtools/cdt/workflows/GithubCI/badge.svg)](https://github.com/codingtools/cdt/actions?query=workflow%3AGithubCI)
 [![CircleCI](https://circleci.com/gh/codingtools/cdt/tree/release%2Frelease-v0.1.svg?style=shield)](https://circleci.com/gh/codingtools/cdt/tree/release%2Frelease-v0.1)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/82d29e2a902a4c338228d636f290d9cd)](https://app.codacy.com/gh/codingtools/cdt?utm_source=github.com&utm_medium=referral&utm_content=codingtools/cdt&utm_campaign=Badge_Grade_Dashboard)
+[![codecov](https://codecov.io/gh/codingtools/cdt/branch/release%2Frelease-v0.1/graph/badge.svg)](https://codecov.io/gh/codingtools/cdt)
 [![Version](https://img.shields.io/npm/v/@codingtools/cdt)](https://npmjs.org/package/@codingtools/cdt)
 ![npm](https://img.shields.io/npm/dt/@codingtools/cdt)
 ![node (scoped)](https://img.shields.io/node/v/@codingtools/cdt)[![GitHub commit activity](https://img.shields.io/github/commit-activity/m/codingtools/cdt)](https://github.com/codingtools/cdt/graphs/commit-activity)