Gspread

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* Dropped Python 2.6 support

* Fixed `KeyError` in `urllib.quote` in Python 2 (605, 558)
* Fixed `Worksheet.title` being out of sync after using `update_title` (542 by ryanpineo)
* Fix parameter typos in docs (616 by bryanallen22)
* Miscellaneous docs fixes (604 by dgilman)
* Fixed typo in docs (591 by davidefiocco)

* Added a method to copy spreadsheets (625 by dsask)
* Added `with_link` attribute when sharing / adding permissions (621 by epicfaace)
* Added ability to duplicate a worksheet (617)
* Change default behaviour of numericise function 499 (502 by danthelion)
* Added `stacklevel=2` to deprecation warnings

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* Fixed 538 (553 by ADraginda)

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* This version drops Google Sheets API v3 support.
- API v4 was the default backend since version 2.0.0.
- All v4-related code has been moved from `gspread.v4` module to `gspread` module.

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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)