Changelog
bf03ca9 feat: add input_data field to error log
74dec09 feat!: make exit when found invalid json
d9e840a feat: change input validate timing
20c0d23 add: -version option
deb6981 add: logger
370091d add: mail sender
4802274 format: go fmt
309c32a add: flag parser
e9772d2 initial wip
