2040a87 Update to 4.2.1

Authored and Committed by music 8 months ago
    Update to 4.2.1
    
    - README.rst is removed upstream in favor of README.md
    - We now package the GitHub archive instead of the PyPI sdist, since the
      latter no longer contains tests
    
    The manual numpy BR is dropped because numpy is now in the “test” extra.
    
        
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