doc: fix codecov badge

README.md

@@ -1,4 +1,4 @@
-# gcache [![Go Reference](https://pkg.go.dev/badge/github.com/cappuccinotm/gcache.svg)](https://pkg.go.dev/github.com/cappuccinotm/gcache) [![Go](https://github.com/cappuccinotm/gcache/actions/workflows/go.yaml/badge.svg)](https://github.com/cappuccinotm/gcache/actions/workflows/go.yaml) [![codecov](https://codecov.io/gh/cappuccinotm/gcache/branch/master/graph/badge.svg?token=ueQqCRqxxS)](https://codecov.io/gh/cappuccinotm/gcache)
+# gcache [![Go Reference](https://pkg.go.dev/badge/github.com/cappuccinotm/gcache.svg)](https://pkg.go.dev/github.com/cappuccinotm/gcache) [![Go](https://github.com/cappuccinotm/gcache/actions/workflows/go.yaml/badge.svg)](https://github.com/cappuccinotm/gcache/actions/workflows/go.yaml) [![codecov](https://codecov.io/gh/cappuccinotm/gcache/graph/badge.svg?token=We5B4lzTNj)](https://codecov.io/gh/cappuccinotm/gcache)
 gcache is a gRPC caching library that provides a simple way to cache gRPC requests and responses. It is designed to be used with gRPC services that have a high request rate and where caching can improve the performance of the service.
 
 It uses a plain old ETag and If-None-Match headers to cache the responses. The cache is stored in memory and is not persistent (unless you use a persistent cache store).