Fix docker badge in README.md (#28)

README.md

@@ -1,4 +1,4 @@
-# Mint [![Slack](https://slack.minio.io/slack?type=svg)](https://slack.minio.io) [![Go Report Card](https://goreportcard.com/badge/minio/minio)](https://goreportcard.com/report/minio/minio) [![Docker Pulls](https://img.shields.io/docker/pulls/minio/minio.svg?maxAge=604800)](https://hub.docker.com/r/minio/minio/) [![codecov](https://codecov.io/gh/minio/minio/branch/master/graph/badge.svg)](https://codecov.io/gh/minio/minio)
+# Mint [![Slack](https://slack.minio.io/slack?type=svg)](https://slack.minio.io) [![Docker Pulls](https://img.shields.io/docker/pulls/minio/mint.svg?maxAge=604800)](https://hub.docker.com/r/minio/mint/)
 
 Collection of tests to detect overall correctness of Minio server.
 
@@ -81,4 +81,4 @@ To add new SDK/CLI to Mint:
 
 - Create new directory in `apps/` directory with corresponding tool name
 - Add a `run.sh` script. This script should set up the SDK/CLI tool and then execute the tests
-- Add an entry in `config.yaml` with name of folder, e.g test_folder
+- Add an entry in `config.yaml` with name of folder, e.g test_folder