nix/pkgs: drop my own python-emv package

There's one in nixpkgs that's more up to date.

nix/pkgs/default.nix

@@ -11,7 +11,6 @@
   copybara = import ./copybara.nix args;
   hg-git = import ./hg-git.nix args;
   erbium = import ./erbium args;
-  python-emv = import ./python-emv.nix args;
   sheepshaver = import ./sheepshaver.nix args;
   intermec-cups-driver = pkgs.callPackage ./intermec-cups-driver.nix {};
   deluge = import ./deluge args;

nix/pkgs/python-emv.nix

@@ -1,39 +0,0 @@
-# SPDX-FileCopyrightText: 2020 Luke Granger-Brown <depot@lukegb.com>
-#
-# SPDX-License-Identifier: Apache-2.0
-
-{ pkgs, ... }:
-with pkgs;
-with pkgs.python3Packages;
-buildPythonPackage rec {
-  pname = "python-emv";
-  version = "1.0.9";
-
-  src = fetchFromGitHub {
-    owner = "russss";
-    repo = "python-emv";
-    rev = "v${version}";
-    hash = "sha256:1ldibcy1wgnaimf8ri79lg8im1mhfqajrigfflvizw0hb0ivh8al";
-  };
-
-  checkInputs = [ pytestCheckHook unittest2 ];
-  propagatedBuildInputs = [
-    enum-compat
-    click
-    pyscard
-    pycountry
-    terminaltables
-  ];
-
-  # argparse is part of the standardlib
-  prePatch = ''
-    substituteInPlace setup.py --replace '"argparse",' ""
-  '';
-
-  meta = with lib; {
-    homepage = "https://github.com/russss/python-emv";
-    description = "A Python implementation of the EMV smartcard protocol, used for chip-and-PIN payments";
-    license = licenses.mit;
-    maintainers = with maintainers; [ lukegb ];
-  };
-}