More verbose output about ranges being brute forced.

src/main.rs

@@ -30,7 +30,7 @@ fn main() {
 }
 
 fn brute(range: Range<u32>) {
-    println!("{}", range.start);
+    println!("{}..{}", range.start, range.end);
     // Init MD2 hasher.
     let mut hasher = Md2::new();
     hasher.update(KNOWN);