fix: Reorder imports in benchmark file for clarity

benches/my_benchmark.rs

@@ -1,5 +1,5 @@
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
 use codingame_rust_template::fib::fibonacci;
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
 
 pub fn criterion_benchmark(c: &mut Criterion) {
     c.bench_function("fib 20", |b| b.iter(|| black_box(fibonacci(20))));