Unintended file `tmp` exists in CB-DF repo

[jihoon-seo]

What happened : PR #124 에서 CB-DF repo root에 tmp 라는 파일이 추가되었는데,

혹시 반드시 필요한 것이 아니라면 삭제하는 것이 좋을 것 같습니다. 😊

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