Merge pull request #816 from dschaller/dschaller-patch-1

docs: use v4 godocs link in readme

Author: dhui

README.md

@@ -109,7 +109,7 @@ $ docker run -v {{ migration dir }}:/migrations --network host migrate/migrate
 * Uses `io.Reader` streams internally for low memory overhead.
 * Thread-safe and no goroutine leaks.
 
-__[Go Documentation](https://godoc.org/github.com/golang-migrate/migrate)__
+__[Go Documentation](https://pkg.go.dev/github.com/golang-migrate/migrate/v4)__
 
 ```go
 import (