go get go.etcd.io/etcd@v3.4.0
go: finding golang.org/x/net master
go: finding go.etcd.io/etcd v3.4.0
go: finding go.etcd.io/etcd v3.4.0
go get go.etcd.io/etcd@v3.4.0: go.etcd.io/etcd@v3.4.0: invalid version: module contains a go.mod file, so major version must be compatible: should be v0 or v1, not v3