Pyexcel

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**Updated**

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**Updated**

. `219 <https://github.com/pyexcel/pyexcel/issues/219>`_: book created from
dict no longer discards order.

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**fixed**

. `214 <https://github.com/pyexcel/pyexcel/issues/214>`_: remove leading and
trailing whitespace for column names

**removed**

. python 2 compatibility have been permanently removed.

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**Updated**

. Restrict this library to get installed on python 3.6+, because pyexcel-io
0.6.0+ supports only python 3.6+.

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**added**