lilv: update from 0.18.0 to 0.20.0

pkgs/development/libraries/audio/lilv/default.nix

···
 
 stdenv.mkDerivation rec {
   name = "lilv-${version}";
-  version = "0.18.0";
+  version = "0.20.0";
 
   src = fetchurl {
     url = "http://download.drobilla.net/${name}.tar.bz2";
-    sha256 = "1k9wfc08ylgbkwbnvh1fx1bdzl3y59xrrx8gv0vk68yzcvcmv6am";
+    sha256 = "0aj2plkx56iar8vzjbq2l7hi7sp0ml99m0h44rgwai2x4vqkk2j2";
   };
 
   buildInputs = [ lv2 pkgconfig python serd sord sratom ];