README.md: Update badges

Author: nhooyr

Diff for: README.md

@@ -1,7 +1,7 @@
 # websocket
 
-[![godoc](https://godoc.org/nhooyr.io/websocket?status.svg)](https://pkg.go.dev/nhooyr.io/websocket)
-[![coverage](https://img.shields.io/badge/coverage-91%25-success)](https://nhooyr.io/websocket/coverage.html)
+[![Go Reference](https://pkg.go.dev/badge/nhooyr.io/websocket.svg)](https://pkg.go.dev/nhooyr.io/websocket)
+[![Go Coverage](https://img.shields.io/badge/coverage-91%25-success)](https://nhooyr.io/websocket/coverage.html)
 
 websocket is a minimal and idiomatic WebSocket library for Go.