curaengine_stable: switch to fetchFromGitHub

pkgs/applications/misc/curaengine/stable.nix

···
-{ lib, stdenv, fetchurl }:
-let
-  version = "15.04.6";
-in
-stdenv.mkDerivation {
+{ lib, stdenv, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
   pname = "curaengine";
-  inherit version;
+  version = "15.04.6";
 
-  src = fetchurl {
-    url = "https://github.com/Ultimaker/CuraEngine/archive/${version}.tar.gz";
-    sha256 = "1cd4dikzvqyj5g80rqwymvh4nwm76vsf78clb37kj6q0fig3qbjg";
+  src = fetchFromGitHub {
+    owner = "Ultimaker";
+    repo = "CuraEngine";
+    rev = version;
+    sha256 = "sha256-8V21TRSqCN+hkTlz51d5A5oK5JOwEtx+ROt8cfJBL/0=";
   };
 
   postPatch = ''