anchor.diff:  
   buildPythonPackage rec {
     pname = "slack-sdk";
  -  version = "3.8.0";
  -  disabled = !isPy3k;
  +  version = "3.9.0";
  +  disabled = pythonOlder "3.6";
   
     src = fetchFromGitHub {
       owner = "slackapi";
       repo = "python-slack-sdk";
       rev = "v${version}";
  -    sha256 = "sha256-r3GgcU4K2jj+4aIytpY2HiVqHzChynn2BCn1VNTL2t0=";
  +    sha256 = "sha256-9iV/l2eX4WB8PkTz+bMJIshdD/Q3K0ig8hIK9R8S/oM=";
     };
   
     propagatedBuildInputs = [
  
positive.code: , fetchFromGitHub
  , flake8
  , flask-sockets
  , isPy3k
  , psutil
  , pytest-asyncio
  , pytestCheckHook
  
negative.code:     databases
      flake8
      flask-sockets
      moto
      psutil
      pytest-asyncio
      pytestCheckHook
  