add txzmq python pkg

pkgs/python-packages/default.nix

@@ -12,6 +12,7 @@ in {
   secp256k1 = callPackage ./secp256k1 {};
   urldecode = callPackage ./urldecode {};
   chromalog = callPackage ./chromalog {};
+  txzmq = callPackage ./txzmq {};
 
   joinmarketbase = joinmarketPkg ./jmbase;
   joinmarketclient = joinmarketPkg ./jmclient;

pkgs/python-packages/txzmq/default.nix

@@ -0,0 +1,28 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, twisted
+, pyzmq
+}:
+
+buildPythonPackage rec {
+  pname = "txzmq";
+  version = "0.8.2";
+
+  src = fetchPypi {
+    pname = "txZMQ";
+    inherit version;
+    sha256 = "07a9a480e58d4d732eef9efd7e264f2348cbf27ee82b338ec818a8504006e1c0";
+  };
+
+  propagatedBuildInputs = [
+    twisted
+    pyzmq
+  ];
+
+  meta = with lib; {
+    description = "Twisted bindings for ZeroMQ";
+    homepage = https://github.com/smira/txZMQ;
+    license = licenses.gpl2;
+  };
+}