README: use pkg.go.dev instead of godoc.org (#883)

README.md

@@ -123,8 +123,8 @@ Released under the [MIT License](LICENSE.txt).
 benchmarking against slightly older versions of other packages. Versions are
 pinned in the [benchmarks/go.mod][] file. [↩](#anchor-versions)
 
-[doc-img]: https://godoc.org/go.uber.org/zap?status.svg
-[doc]: https://godoc.org/go.uber.org/zap
+[doc-img]: https://pkg.go.dev/badge/go.uber.org/zap
+[doc]: https://pkg.go.dev/go.uber.org/zap
 [ci-img]: https://travis-ci.com/uber-go/zap.svg?branch=master
 [ci]: https://travis-ci.com/uber-go/zap
 [cov-img]: https://codecov.io/gh/uber-go/zap/branch/master/graph/badge.svg