Pyexcel-xls

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**Removed**

. `52 <https://github.com/pyexcel/pyexcel-xls/issues/52>`_: remove xlsm
support for xlrd > 2.0.0

**Updated**

. `54 <https://github.com/pyexcel/pyexcel-xls/issues/54>`_: first project in
pyexcel to migrate to pytest

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**Removed**

. `46 <https://github.com/pyexcel/pyexcel-xls/issues/46>`_: remove the hard
pin on xlrd version < 2.0

**Added**

. `47 <https://github.com/pyexcel/pyexcel-xls/issues/47>`_: limit support to
persist datetime.timedelta. see more details in doc

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**Updated**

. lock down xlrd version less than version 2.0, because 2.0+ does not support
xlsx read

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**Updated**

. Compatability with openpyxl 3.1.0 and later

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**Updated**

. New style xlsx plugins, promoted by pyexcel-io v0.6.2.

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**Added**

. `35 <https://github.com/pyexcel/pyexcel-xls/issues/35>`_, include tests