fix CodeCov badge (#61)

README.md

@@ -2,8 +2,8 @@
 An ActivityPub Relay
 
 [![Go Report Card](https://goreportcard.com/badge/github.com/feditools/relay?style=flat-square)](https://goreportcard.com/report/github.com/feditools/relay)
-[![codecov](https://codecov.io/gh/feditools/relay/branch/develop/graph/badge.svg)](https://codecov.io/gh/feditools/relay)
+[![codecov](https://codecov.io/gh/feditools/relay/branch/devel/graph/badge.svg?token=VHvcrcqotl)](https://codecov.io/gh/feditools/relay)
 [![Crowdin](https://badges.crowdin.net/feditools-relay/localized.svg)](https://crowdin.com/project/feditools-relay)
 [![License](https://img.shields.io/github/license/feditools/relay)](https://www.gnu.org/licenses/gpl-3.0.en.html)
 [![Release](https://img.shields.io/github/release/feditools/relay.svg?style=flat-square)](https://github.com/feditools/relay/releases/latest)
-[![PkgGoDev](https://pkg.go.dev/badge/github.com/feditools/relay)](https://pkg.go.dev/github.com/feditools/relay)
+[![PkgGoDev](https://pkg.go.dev/badge/github.com/feditools/relay)](https://pkg.go.dev/github.com/feditools/relay)