Update README stars

README.md

@@ -23,7 +23,7 @@ All Go solutions should be runnable through just go running the **file**. I make
 | [Day 9](https://adventofcode.com/2023/day/9) | ⭐ | ⭐ |
 | [Day 10](https://adventofcode.com/2023/day/10) | ⭐ | ⭐ |
 | [Day 11](https://adventofcode.com/2023/day/11) | ⭐ | ⭐ |
-| [Day 12](https://adventofcode.com/2023/day/12) | ⭐ |   |
+| [Day 12](https://adventofcode.com/2023/day/12) | ⭐ | ⭐ |
 | [Day 13](https://adventofcode.com/2023/day/13) | ⭐ | ⭐ |
 | [Day 14](https://adventofcode.com/2023/day/14) | ⭐ | ⭐ |
 | [Day 15](https://adventofcode.com/2023/day/15) | ⭐ | ⭐ |