Zero padding to lists

It works like this. Starting with:
```markdown
1. one
2. two
3. .
4. .
5. .
6. .
7. .
8. .
9. .
```
If the list exceeded 10, it should pad zero to one-digit numbers, making the list items on the same level.
```markdown
07. .
08. .
09. .
10. .
11. .
```