Include day 22 in benchmarks.

2018/benches/days.rs

@@ -73,9 +73,10 @@ day_bench!(day18, 18);
 day_bench!(day19, 19);
 day_bench!(day20, 20);
 day_bench!(day21, 21);
+day_bench!(day22, 22);
 
 benchmark_main!(day01, day02, day03, day04, day05,
                 day06, day07, day08, day09, day10,
                 day11, day12, day13, day14, day15,
                 day16, day17, day18, day19, day20,
-                day21);
+                day21, day22);