pythonPackages.zict: Move to own file

pkgs/development/python-modules/zict/default.nix

@@ -0,0 +1,22 @@
+{ stdenv, buildPythonPackage, fetchPypi
+, pytest, heapdict }:
+
+buildPythonPackage rec {
+  pname = "zict";
+  version = "0.1.1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "12h95vbkbar1hc6cr1kpr6zr486grj3mpx4lznvmnai0iy6pbqp4";
+  };
+
+  buildInputs = [ pytest ];
+  propagatedBuildInputs = [ heapdict ];
+
+  meta = with stdenv.lib; {
+    description = "Mutable mapping tools.";
+    homepage = https://github.com/dask/zict;
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ teh ];
+  };
+}