Problematic suggestion about the select chapter

[stefanos82]

In this suggestion,

learn-go-with-tests/select.md

Line 318 in 11abe1f

The compiler will complain about your _first test_ only looking for one value so change that line to `got, err := Racer(slowURL, fastURL)`, knowing that we should check we _don't_ get an error in our happy scenario.

you are missing the implementation for

if err != nil {
    t.Fatalf("did not expect an error but got one %v", err)
}

because if we add the err here in got, err := Racer(slowURL, fastURL), the compiler will complain about err being unused here.

I know that the aforementioned if condition is mentioned afterwards, but it should have been demonstrated immediately after the err suggestion.