class `Buffer` is missing the `.cropped()` method in Bindings

```python
>>> from halide import Buffer
>>> b = Buffer()
>>> b.cropped
Traceback (most recent call last):
  File "<python-input-2>", line 1, in <module>
    b.cropped
AttributeError: 'halide.halide_.Buffer' object has no attribute 'cropped'
```

I am trying to pass a subsection of a buffer into a pipeline and need access to this from Python.