Pyexcel-xls

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**Updated**

. `18 <https://github.com/pyexcel/pyexcel-xls/issues/18>`_, pass on
encoding_override and others to xlrd.

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**Updated**

. `16 <https://github.com/pyexcel/pyexcel-xls/issues/16>`_, allow mmap to be
passed as file content

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**Updated**

. `14 <https://github.com/pyexcel/pyexcel-xls/issues/14>`_, Python 3.6 -
cannot use LOCALE flag with a str pattern

. `13 <https://github.com/pyexcel/pyexcel-xlsx/issues/13>`_, turn read_only
flag on openpyxl.

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**Updated**

. `12 <https://github.com/pyexcel/pyexcel-xlsx/issues/12>`_, remove
UserWarning: Using a coordinate with ws.cell is deprecated. Use
ws[coordinate]

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**Added**

. support pagination. two pairs: start_row, row_limit and start_column,
column_limit help you deal with large files.