Golang kakaotalk chat bot making

I have developed a chat bot [1] for Kakaotalk [2] using Go language because I have been curious about the process of Kakaotalk chat bot development process. Implementation to major version has consumed only two hours owing to power of Go language, simpleness of Kakaotalk auto-reply API, and simple simple functionality requirement of my bot. It has coded really simply and in brute-force manner, do only simple echoing. However, for the reason, the code could be helpful for beginner of Kakaotalk chat bot or Go language Restful API server programmer.