anchor.diff:  
   buildPythonPackage rec {
     pname = "readme_renderer";
  -  version = "17.2";
  -  name = "${pname}-${version}";
  +  version = "17.4";
   
     src = fetchPypi {
       inherit pname version;
  -    sha256 = "9deab442963a63a71ab494bf581b1c844473995a2357f4b3228a1df1c8cba8da";
  +    sha256 = "82d68175feec897af2a38fe8590778f14c3be5324cc62e3ce5752a9b1e4b60ab";
     };
   
     checkInputs = [ pytest ];
   
     propagatedBuildInputs = [
  -    bleach docutils pygments six
  +    CommonMark bleach docutils pygments six
     ];
   
     checkPhase = ''
  
positive.code:     homepage = https://github.com/pypa/readme_renderer;
      license = lib.licenses.asl20;
    };
  }
negative.code: , buildPythonPackage
  , fetchPypi
  , pytest
  , CommonMark
  , bleach
  , docutils
  , pygments
  