The following packes did not have discernible LICENSE files at the hash we have
vendored:
github.com/beorn7/perks
github.com/daviddengcn/go-colortext
github.com/garyburd/redigo
github.com/prometheus/common
github.com/shurcooL/sanitized_anchor_name
github.com/stretchr/objx
This commit updates all of them and updates the central LICENSE file.