DataTable `clear` is missing

[asyd]

DataTable doc refers to a clear() method, but doesn't exists:

>>> from textual.widgets import DataTable
>>> test = DataTable()
>>> test.clear()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'DataTable' object has no attribute 'clear'
>>> test.add_row('test')

[darrenburns]

The docs were updated a little prematurely - this'll be part of the next release (which I think will be this weekend, but @willmcgugan can confirm)

[rodrigogiraoserrao]

0.5.0 added the method DataTable.clear 😃

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