anchor.diff:  }:
   
   let
  -  version = "1.4.3";
  +  version = "1.5.0";
   in
   buildPythonPackage {
     name = "bleach-${version}";
  
positive.code:   src = fetchPyPi {
      package = "bleach";
      inherit version;
      sha256 = "1293061adb5a9eebb7b260516e691785ac08cc1646c8976aeda7db9dbb1c6f4b";
    };
  
    propagatedBuildInputs = [
  
negative.code:     six
    ];
  
    postPatch = ''
      sed -i '/html5lib/ s/\(,\|\)\(!\|>\|<\|=\)\(=\|\)[0-9.]\+//g' setup.py bleach.egg-info/requires.txt
    '';
  
    meta = with stdenv.lib; {
  