Add file download one-liner

@@ -258,3 +258,9 @@ res = int("".join(map(str, items)))

rotated = items[n:] + items[:n]

```

**Example:** `items=[1,2,3,4,5], n=2 → [3,4,5,1,2]`

## Download a file using requests

```python

import requests; open('file.ext', 'wb').write(requests.get(url).content)

```

**Example:** `requests.get('https://example.com/logo.png')` → saves as `file.ext`