Gsheets

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Change ``ws.to_frame()`` method to make assignment of worksheet title to ``name``
attribute of ``pandas.DataFrame`` opt-in by ``assign_name`` kwarg.

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Drop Python 3.4 support.

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Add/fix oauth2client dependency (dropped from google-api-python-client).

Drop Python 3.3 support, tag Python 3.7 support.

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Fetch datetime values as strings instead of days since December 30th 1899
(backwards imcompatible, PR Andrea Nardelli).

Fix handling of empty worksheets (PR lanfon72).

Include LICENSE file in wheel.

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Make A1 notation slices inclusive (backwards incompatible).

Also support template strings for ``make_filename``.

Change ``make_filename`` callable to a one argument functon given a dictionary.

Add equivalence for ``SpreadSheet``, ``SheetsView``, and ``WorkSheet``.

Include ``get_credentials()`` and ``build_service()`` as low-level api functions.

Add ``no_webserver`` auth for working on remote machines.

Change default filename for client secrets to ``'client_secrets.json'``.

Include docs in source distribution.

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First release (read-only access).