read repo_name when opening repos

tests/repo/repo.rs

@@ -3,7 +3,7 @@ use std::error::Error;
 use gentoo_utils::repo::Repo;
 
 fn main() -> Result<(), Box<dyn Error>> {
-    let repo = Repo::new("/var/db/repos/gentoo");
+    let repo = Repo::new("/var/db/repos/gentoo").unwrap();
 
     for result in repo.categories()? {
         let cat = result?;