Change refs from `cli.go` to cli
Change refs from `cli.go` to cli

since the days of this being a single-file library are long gone.

phinnaeus/cli,murdinc/cli,minio/cli,cmars/tools,cmars/tools,pjvds/cli,minio/cli,ykanda/cli,cmars/tools,pjvds/cli,urfave/cli,pjvds/cli,urfave/cli,phinnaeus/cli,ykanda/cli,codegangsta/cli,ykanda/cli,murdinc/cli,cmars/tools,codegangsta/cli,minio/cli,murdinc/cli,phinnaeus/cli