liran-funaro / sphinx-markdown-builder / 43191847478

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Keep the start number of enumerated lists (#127)

## Summary

`visit_enumerated_list` always started the list at 1 and ignored the
`start` attribute that docutils sets, so a list that starts at `3.` was
renumbered from `1.`. It now starts from `node.get("start", 1) - 1`.
CommonMark keeps the start number of the first item, so the original
numbers are kept. Letter and roman styles still become numbers, since
Markdown has no such lists.

Fixture: a list starting at 3 is added next to the existing ordered list
in `tests/source/ExampleRSTFile.rst`.

## Before / after

Input:

```rst
3. Select **Save**.
4. Close the page.
```

Before:

```markdown
1. Select **Save**.
2. Close the page.
```

After:

```markdown
3. Select **Save**.
4. Close the page.
```

## Checks

- `make lint`: passed (black, flake8, pylint 10.00/10)
- `make test`: passed (diff test clean, 15 passed, coverage 100%)

Closes #118

2 of 2 new or added lines in 1 file covered. (100.0%)

775 of 775 relevant lines covered (100.0%)

4.0 hits per line