easyrsa2: switch to fetchFromGitHub

pkgs/tools/networking/easyrsa/2.x.nix

@@ -1,6 +1,6 @@
 { lib
 , stdenv
-, fetchurl
+, fetchFromGitHub
 , autoreconfHook
 , makeWrapper
 , gnugrep
@@ -11,9 +11,11 @@ stdenv.mkDerivation rec {
   pname = "easyrsa";
   version = "2.2.0";
 
-  src = fetchurl {
-    url = "https://github.com/OpenVPN/easy-rsa/archive/v${version}.tar.gz";
-    sha256 = "1xq4by5frb6ikn53ss3y8v7ss639dccxfq8jfrbk07ynkmk668qk";
+  src = fetchFromGitHub {
+    owner = "OpenVPN";
+    repo = "easy-rsa";
+    rev = "v${version}";
+    sha256 = "sha256-zTdk8mv+gC/SHK813wZ6CWZf9Jm2XkKfAPU3feFpAkY=";
   };
 
   preBuild = ''