go-micro: go get -u fails, apparently due to coreos/etcd move

Go version: go1.13 Problem: when I run go get -u github.com/micro/go-micro I get the following error:

# github.com/coreos/etcd/clientv3
src/github.com/coreos/etcd/clientv3/auth.go:121:72: cannot use auth.callOpts (type []"github.com/coreos/etcd/vendor/google.golang.org/grpc".CallOption) as type []"go.etcd.io/etcd/vendor/google.golang.org/grpc".CallOption in argument to auth.remote.AuthEnable
src/github.com/coreos/etcd/clientv3/auth.go:126:74: cannot use auth.callOpts (type []"github.com/coreos/etcd/vendor/google.golang.org/grpc".CallOption) as type []"go.etcd.io/etcd/vendor/google.golang.org/grpc".CallOption in argument to auth.remote.AuthDisable
src/github.com/coreos/etcd/clientv3/auth.go:131:152: cannot use auth.callOpts (type []"github.com/coreos/etcd/vendor/google.golang.org/grpc".CallOption) as type []"go.etcd.io/etcd/vendor/google.golang.org/grpc".CallOption in argument to auth.remote.UserAdd
src/github.com/coreos/etcd/clientv3/auth.go:136:144: cannot use auth.callOpts (type []"github.com/coreos/etcd/vendor/google.golang.org/grpc".CallOption) as type []"go.etcd.io/etcd/vendor/google.golang.org/grpc".CallOption in argument to auth.remote.UserAdd
src/github.com/coreos/etcd/clientv3/auth.go:141:86: cannot use auth.callOpts (type []"github.com/coreos/etcd/vendor/google.golang.org/grpc".CallOption) as type []"go.etcd.io/etcd/vendor/google.golang.org/grpc".CallOption in argument to auth.remote.UserDelete
src/github.com/coreos/etcd/clientv3/auth.go:146:122: cannot use auth.callOpts (type []"github.com/coreos/etcd/vendor/google.golang.org/grpc".CallOption) as type []"go.etcd.io/etcd/vendor/google.golang.org/grpc".CallOption in argument to auth.remote.UserChangePassword
src/github.com/coreos/etcd/clientv3/auth.go:151:104: cannot use auth.callOpts (type []"github.com/coreos/etcd/vendor/google.golang.org/grpc".CallOption) as type []"go.etcd.io/etcd/vendor/google.golang.org/grpc".CallOption in argument to auth.remote.UserGrantRole
src/github.com/coreos/etcd/clientv3/auth.go:156:80: cannot use auth.callOpts (type []"github.com/coreos/etcd/vendor/google.golang.org/grpc".CallOption) as type []"go.etcd.io/etcd/vendor/google.golang.org/grpc".CallOption in argument to auth.remote.UserGet
src/github.com/coreos/etcd/clientv3/auth.go:161:72: cannot use auth.callOpts (type []"github.com/coreos/etcd/vendor/google.golang.org/grpc".CallOption) as type []"go.etcd.io/etcd/vendor/google.golang.org/grpc".CallOption in argument to auth.remote.UserList
src/github.com/coreos/etcd/clientv3/auth.go:166:106: cannot use auth.callOpts (type []"github.com/coreos/etcd/vendor/google.golang.org/grpc".CallOption) as type []"go.etcd.io/etcd/vendor/google.golang.org/grpc".CallOption in argument to auth.remote.UserRevokeRole
src/github.com/coreos/etcd/clientv3/auth.go:166:106: too many errors

We first saw this error when our CI build began to fail, and at first couldn’t reproduce it locally, but then were able to by adding the -u to the command. Alternately, here’s a simple Dockerfile that demonstrates the issue when building it.

This seems to be caused by the moving of github.com/coreos/etcd to github.com/etcd-io/etcd, as described here: https://github.com/etcd-io/etcd/pull/10044#issuecomment-417125341

That change and the issue are from last year, so I’m not sure why this is just showing up now, but my colleagues and I (and our CI) can all reproduce the problem now.

I will look into creating a PR that changes the imports from coreos/etcd to etcd-io/etcd.