Easily detect the GOPATH in current development environment.

[xauthulei]

It will be useful to a new go developer and also easy to detect the GOPATH in different go env.

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This change is 

[k8s-ci-robot]

Hi @xauthulei. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[coveralls]

Coverage remained the same at 76.744% when pulling 8829fad on xauthulei:dev into eb02785 on kubeflow:master.

[gaocegege]

/ok-to-test
/lgtm
/approve

Thanks for your contribution! 🎉 👍

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gaocegege

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[gaocegege]

@xauthulei

Thanks for your contribution. Welcome more contributions!

[xauthulei]

@gaocegege ,Yea, it's really my honor, and I will. Thanks for your great review efforts here.