docs: add codecov badge

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
appleboy · Jan 2, 2022 · 9b7fb55 · 9b7fb55
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 # graceful
 
 [![Run Tests](https://github.com/appleboy/graceful/actions/workflows/go.yml/badge.svg)](https://github.com/appleboy/graceful/actions/workflows/go.yml)
+[![codecov](https://codecov.io/gh/appleboy/graceful/branch/master/graph/badge.svg?token=zPqtcz0Rum)](https://codecov.io/gh/appleboy/graceful)
 
 Graceful shutdown package when a service is turned off by software function.