Remove unnecessary expect

src/bin/p01.rs

@@ -19,7 +19,7 @@ fn main() {
                 println!(
                     "new cals: {}, max so far: {}",
                     cur_cals,
-                    heap.peek().expect("Can't peek from heap!")
+                    heap.peek().unwrap()
                 );
                 cur_cals = 0;
             }