Solve Day 6 & 8, refactor Day 6 with itertools

README.md

@@ -16,8 +16,9 @@ Solutions for [Advent of Code](https://adventofcode.com/) in [Rust](https://www.
 | [Day 3](./src/bin/03.rs) | `85.1µs` | `121.6µs` |
 | [Day 4](./src/bin/04.rs) | `244.2µs` | `4.1ms` |
 | [Day 5](./src/bin/05.rs) | `196.7µs` | `66.3µs` |
+| [Day 6](./src/bin/06.rs) | `109.0µs` | `194.2µs` |
 
-**Total: 5.49ms**
+**Total: 5.79ms**
 <!--- benchmarking table --->
 
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