kea: 2.2.0 -> 2.4.0

https://downloads.isc.org/isc/kea/2.4.0/Kea-2.4.0-ReleaseNotes.txt

pkgs/tools/networking/kea/default.nix

@@ -20,11 +20,11 @@
 
 stdenv.mkDerivation rec {
   pname = "kea";
-  version = "2.2.0"; # only even minor versions are stable
+  version = "2.4.0"; # only even minor versions are stable
 
   src = fetchurl {
     url = "https://ftp.isc.org/isc/${pname}/${version}/${pname}-${version}.tar.gz";
-    sha256 = "sha256-2n2QymKncmAtrG535QcxkDhCKJWtaO6xQvFIfWfVMdI=";
+    hash = "sha256-OjPNCNwzGf9UTmu/LAQpBCEG9AUevhFdwbsmJclQA/c=";
   };
 
   patches = [
@@ -83,6 +83,7 @@ stdenv.mkDerivation rec {
   };
 
   meta = with lib; {
+    changelog = "https://downloads.isc.org/isc/kea/${version}/Kea-${version}-ReleaseNotes.txt";
     homepage = "https://kea.isc.org/";
     description = "High-performance, extensible DHCP server by ISC";
     longDescription = ''