Can't set max_row or max_column in ReadOnlyWorksheet
*Created originally on Bitbucket by [brosentreter (Brandt)](https://bitbucket.org/%7B67f0afc0-8036-4f98-aef9-458cf362a549%7D/)* When using `load_workbook(file, read_only=True).active` the returned worksheet is of the class ReadOnlyWorksheet. In the [documentation it specifically states,](https://openpyxl.readthedocs.io/en/stable/optimized.html#worksheet-dimensions) as it was for the previous version before 2.6.x that to set `max_row = max_column = None` in order to avoid the bounds being default set to 1 and 1 respectively. In the 2.6.x update, these values were made unsettable, as can be seen in this [commit](https://bitbucket.org/openpyxl/openpyxl/commits/ef694f6dc0cf529e720a1e8927940f7d7445b406). With the new version 2.6.x and going forward, my question is, what is the proper way to get around this known issue with read_only mode?
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