Update README.md

README.md

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 [![Auto Nightly CI](https://github.com/spidernet-io/egressgateway/actions/workflows/auto-nightly-ci.yaml/badge.svg)](https://github.com/spidernet-io/egressgateway/actions/workflows/auto-nightly-ci.yaml)
 [![Auto Release Version](https://github.com/spidernet-io/egressgateway/actions/workflows/auto-release.yaml/badge.svg)](https://github.com/spidernet-io/egressgateway/actions/workflows/auto-release.yaml)
+[![codecov](https://codecov.io/gh/spidernet-io/egressgateway/branch/main/graph/badge.svg?token=8CCT4CIIPx)](https://codecov.io/gh/spidernet-io/egressgateway)
 [![Go Report Card](https://goreportcard.com/badge/github.com/spidernet-io/egressgateway)](https://goreportcard.com/report/github.com/spidernet-io/egressgateway)
-[![CodeFactor](https://www.codefactor.io/repository/github/spidernet-io/egressgateway/badge)](https://www.codefactor.io/repository/github/spidernet-io/egressgateway)
 ![badge](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/bzsuni/cc6d42eb27d8ee4c3d19c936eff2c478/raw/egressgatewaye2e.json)
 [![OpenSSF Best Practices](https://bestpractices.coreinfrastructure.org/projects/7410/badge)](https://bestpractices.coreinfrastructure.org/projects/7410)