Log Message:
py-natsort: updated to 6.2.0

6.2.0:
Added
 - Support for Python 3.8

Changed
 - `index_natsorted` internally now uses tuples for index-element pairs
   instead of lists
 - Added a TOC to the README
 - Python 3.4 is no longer included in testing

Fixed
 - Pin testing dependencies to prevent CI breaking due to third-party
   library changes

Removed
 - Introduction page in documentation