Missing 'go_package' option

protoc --proto_path=. --micro_out=Mproto/imports/api.proto=github.com/micro/go-micro/v2/api/proto:. --go_out=Mproto/imports/api.proto=github.com/micro/go-micro/v2/api/proto:. proto/helloworld/helloworld.proto
2020/07/03 12:24:58 WARNING: Missing 'go_package' option in "proto/helloworld/helloworld.proto",
please specify it with the full Go package path as
a future release of protoc-gen-go will require this be specified.
See https://developers.google.com/protocol-buffers/docs/reference/go-generated#package for more information.

option go_package = "proto/helloworld";

undefined: balancer.PickOptions

# github.com/coreos/etcd/clientv3/balancer/resolver/endpoint
../../go/pkg/mod/github.com/coreos/etcd@v3.3.22+incompatible/clientv3/balancer/resolver/endpoint/endpoint.go:114:78: undefined: resolver.BuildOption
../../go/pkg/mod/github.com/coreos/etcd@v3.3.22+incompatible/clientv3/balancer/resolver/endpoint/endpoint.go:182:31: undefined: resolver.ResolveNowOption
# github.com/coreos/etcd/clientv3/balancer/picker
../../go/pkg/mod/github.com/coreos/etcd@v3.3.22+incompatible/clientv3/balancer/picker/err.go:37:44: undefined: balancer.PickOptions
../../go/pkg/mod/github.com/coreos/etcd@v3.3.22+incompatible/clientv3/balancer/picker/roundrobin_balanced.go:55:54: undefined: balancer.PickOptions

https://segmentfault.com/q/10...