bad go module version

[okhowang]

reference: golang/go#35732
when version go to v2, v3 and so on.
module path should be end with v2, v3

Steps for Reproduction

mkdir a
cd a
go mod init a
go get -v github.com/eko/gocache@v2.0.0

Expected behavior:
get correct module

Actual behavior:
output

go get: github.com/eko/gocache@v2.0.0: invalid version: module contains a go.mod file, so major version must be compatible: should be v0 or v1, not v2