nixui: switch to fetchFromGitHub

pkgs/tools/package-management/nixui/default.nix

···
-{ lib, stdenv, pkgs, fetchgit, nix, node_webkit, makeDesktopItem
+{ lib, stdenv, pkgs, fetchFromGitHub, nix, node_webkit, makeDesktopItem
 , writeScript }:
 let
-  version = "0.2.1";
-  src = fetchgit {
-    url = "https://github.com/matejc/nixui.git";
-    rev = "845a5f4a33f1d0c509c727c130d0792a5b450a38";
-    sha256 = "1ay3i4lgzs3axbby06l4vvspxi0aa9pwiil84qj0dqq1jb6isara";
-  };
   nixui = (import ./nixui.nix {
     inherit pkgs;
     inherit (stdenv.hostPlatform) system;
···
     genericName = "NixUI";
   };
 in
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   pname = "nixui";
-  inherit version src;
+  version = "0.2.1";
+  src = fetchFromGitHub {
+    owner = "matejc";
+    repo = "nixui";
+    rev = version;
+    sha256 = "sha256-KisdzZIB4wYkJojGyG9SCsR+9d6EGuDX6mro/yiJw6s=";
+  };
   installPhase = ''
     mkdir -p $out/bin
     ln -s ${script} $out/bin/nixui