fix: allow unused imports for freebsd

src/output/mod.rs

@@ -1,4 +1,5 @@
 #[cfg_attr(target_os = "netbsd", allow(unused_imports))]
+#[cfg_attr(target_os = "freebsd", allow(unused_imports))]
 pub use self::cell::{DisplayWidth, TextCell, TextCellContents};
 pub use self::escape::escape;