Changelog

ff832d6 add go.sum updates from goreleaser builds
9adf95e add pull-requests command
60580c8 add pull-requests command to readme
8d92ea8 add stats module
e3340bd if --days-back is 0 include all data
a8830ef move repo and org options to root command
9a0b5cf readme: add basic installation instructions
d3777f0 readme: use binary name instead of go run