anchor.diff:  
   buildPythonPackage rec {
     pname = "nats-py";
  -  version = "2.1.7";
  +  version = "2.2.0";
     format = "setuptools";
   
     disabled = pythonOlder "3.7";
  
positive.code:     owner = "nats-io";
      repo = "nats.py";
      rev = "refs/tags/v${version}";
      hash = "sha256-K2ugTwfeYrdBnXFV9SHNQP+fNvUmc1yuy53gpGmmvS0=";
    };
  
    propagatedBuildInputs = [
      ed25519
    ];
  
  
negative.code: { lib
  , stdenv
  , aiohttp
  , buildPythonPackage
  , ed25519
  , fetchFromGitHub
  