Gspread

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* Fixed 533 (534 by reallistic)

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* URL encode the range in the value_* functions (530 by aiguofer)
* Open team drive sheets by name (527 by ryantuck)

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* Fixed 518
* Include v4 in setup.py
* Fetch all spreadsheets in Spreadsheet.list_spreadsheet_files (522 by aiguofer)

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* Ported the library to Google Sheets API v4.

This is a transition release. The v3-related code is untouched,
but v4 is used by default. It is encouraged to move to v4 since
the API is faster and has more features.

API v4 is a significant change from v3. Some methods are not
backward compatible, so there's no support for this compatibility
in gspread either.

These methods and properties are not supported in v4:

* `Spreadsheet.updated`
* `Worksheet.updated`
* `Worksheet.export()`
* `Cell.input_value`

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* Remove deprecated HTTPError

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* Fixed error when inserting permissions 431