rust: add solution for year 2017, day 18, part 2 to runner

Author: saser

rust/src/main.rs

@@ -95,6 +95,7 @@ fn imain() -> i32 {
         (2017, 17, 1) => Ok(aoc::year2017::day17::part1),
         (2017, 17, 2) => Ok(aoc::year2017::day17::part2),
         (2017, 18, 1) => Ok(aoc::year2017::day18::part1),
+        (2017, 18, 2) => Ok(aoc::year2017::day18::part2),
         (2017, 19, 1) => Ok(aoc::year2017::day19::part1),
         (2017, 19, 2) => Ok(aoc::year2017::day19::part2),
         // Year 2018.