Fix arch based distribution identification (#147)

src/steps/os/linux.rs

@@ -40,7 +40,7 @@ impl Distribution {
             match (os_release.id.as_ref(), os_release.id_like.as_ref().map(String::as_str)) {
                 (_, Some("debian")) | (_, Some("ubuntu")) => Distribution::Debian,
                 (_, Some("\"suse\"")) => Distribution::Suse,
-                ("arch", _) => Distribution::Arch,
+                ("arch", _) | (_, Some("archlinux")) => Distribution::Arch,
                 ("centos", _) | ("\"ol\"", _) => Distribution::CentOS,
                 ("fedora", _) => Distribution::Fedora,
                 ("void", _) => Distribution::Void,