cpp2sky build issue

[yanlei yu]

I build the build content in according to https://github.com/SkyAPM/cpp2sky/tree/v0.4.0, an error ：

Starting local Bazel server and connecting to it...
ERROR: /home/kafka/software/kafkac/cpp2skytest/main/BUILD:1:10: no such package '@com_github_skyapm_cpp2sky//cpp2sky': BUILD file not found in directory 'cpp2sky' of external repository @com_github_skyapm_cpp2sky. Add a BUILD file to a directory to mark it as a package. and referenced by '//main:example'
ERROR: Analysis of target '//main:example' failed; build aborted: Analysis failed
INFO: Elapsed time: 4.631s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (32 packages loaded, 125 targets configured)
    Fetching repository @local_config_cc; starting

I don't know whether there is a problem with my configuration or with cpp2sky？