removed opt level for debug.

Author: Mike-Neto

Cargo.toml

@@ -27,6 +27,3 @@ predicates = "1.0.2"
 [[bench]]
 name = "bench"
 harness = false
-
-[profile.dev]
-opt-level = 3

benches/bench.rs

@@ -16,7 +16,6 @@ fn end_to_end(c: &mut Criterion) {
     let mut group = c.benchmark_group("img_diff");
     group.sample_size(20);
     group.bench_function("png", |b| b.iter(|| do_diff(&config)));
-
     group.bench_function("bmp", |b| b.iter(|| do_diff(&config)));
     group.finish();
 }