error: certificate signed by unknown authority

Hi,

Thank you for the package! I'm struggling with the following problem due installation instruction from README. Right after the command `go get github.com/google/uuid` I'm getting the following error:

```bash
$ go get github.com/google/uuid

go: downloading github.com/google/uuid v1.3.0
go get: github.com/google/uuid@v1.3.0: verifying module: github.com/google/uuid@v1.3.0: Get "https://sum.golang.org/lookup/github.com/google/uuid@v1.3.0": x509: certificate signed by unknown authority
```

version:
```bash
$ go version
go version go1.17.2 darwin/amd64
```

Could you help me please?