git-codeowners-0.1.0 is not a library.
git-codeowners 
a git extention for Github CODEOWNERS files
usage
git-codeowners is intended for use as a git extention ( a program whose name starts with git- ) to extend your git workflow.
$ git codeowners src/main.rs
@softprops
$ git-codeowners --help
git-codeowners 0.1.0
Github CODEOWNERS answer sheet
USAGE:
git-codeowners [FLAGS] [OPTIONS] <path>
FLAGS:
-e, --emails Only return emails
-h, --help Prints help information
-t, --teams Only return teams
-u, --users Only return users
-V, --version Prints version information
OPTIONS:
-c, --codeowners <codeowners> An explicit path for a CODEOWNERS file. program will exit 1 if file can not be resolved
ARGS:
<path> Path of file in git repo. if '-' is provided path will be read from stdin. program will exit 2 if no owners can be resolved
Doug Tangren (softprops) 2017