カバレッジバッジを追加

Author: k163377

README.md

@@ -1,6 +1,7 @@
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![CircleCI](https://circleci.com/gh/ProjectMapK/Shared.svg?style=svg)](https://circleci.com/gh/ProjectMapK/Shared)
 [![](https://jitci.com/gh/ProjectMapK/Shared/svg)](https://jitci.com/gh/ProjectMapK/Shared)
+[![codecov](https://codecov.io/gh/ProjectMapK/Shared/branch/master/graph/badge.svg)](https://codecov.io/gh/ProjectMapK/Shared)
 
 A `Shared` module for ProjectMapK.
 ====