cargo fmt

exercise/logging/src/lib.rs

@@ -6,7 +6,7 @@
 //
 // Hint: You need to update Cargo.toml to add the `log` dependency, first.
 
-use log::{error, warn, info, debug, trace};
+use log::{debug, error, info, trace, warn};
 
 #[derive(Debug)]
 pub struct Frog {