Pyexcel-io

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**removed**

. python 3.6 lower versions are no longer supported

**updated**

. pyexcel-io plugin interface has been rewritten. PyInstaller user will be
impacted. please read 'Packaging with Pyinstaller' in the documentation.
. new query set reader plugin. pyexcel<=0.6.4 has used intrusive way of getting
query set source done. it is against the plugin interface.

**fixed**

. `74 <https://github.com/pyexcel/pyexcel-io/issues/74>`_: handle zip files
which contain non-UTF-8 encoded files.

**added**

. `86 <https://github.com/pyexcel/pyexcel-io/issues/86>`_: allow trailing
options, get_data(...keep_trailing_empty_cells=True).

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**updated**

. `70 <https://github.com/pyexcel/pyexcel-io/issues/70>`_: when the given file
is a root directory, the error shall read it is not a file

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**updated**

. `pyexcel185 <https://github.com/pyexcel/pyexcel/issues/185>`_: handle stream
conversion if file type(html) needs string content then bytes to handle

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**updated**

. `69 <https://github.com/pyexcel/pyexcel-io/issues/69>`_: Force file
type(force_file_type) on write

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**updated**

. `68 <https://github.com/pyexcel/pyexcel-io/issues/68>`_: Raise IOError when
the data file does not exist

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**updated**

. `67 <https://github.com/pyexcel/pyexcel-io/issues/67>`_: fix conversion
issue for long type on python 2.7 for ods