fix ci push:Untracked files...

[dchaofei]

The newly generated file does not seem to be submitted.

[Publish] New code has been generated and pushed

To github.com:wechaty/go-grpc.git
 * [new tag]         v0.18.11 -> v0.18.11

[Publish] New version 0.18.11 has been tagged

On branch master
Your branch is up to date with 'origin/master'.

Untracked files:
  (use "git add <file>..." to include in what will be committed)
    wechaty/puppet/file_box.pb.go

nothing added to commit but untracked files present (use "git add" to track)
~/work/grpc/grpc/go

[huan]

We have added the file manually by hand, so we do not need this PR anymore.