vmpk: 0.8.2 -> 0.8.4

pkgs/applications/audio/vmpk/default.nix

···
 
 mkDerivation rec {
   pname = "vmpk";
-  version = "0.8.2";
+  version = "0.8.4";
 
   src = fetchurl {
     url = "mirror://sourceforge/${pname}/${version}/${pname}-${version}.tar.bz2";
-    sha256 = "1kv256j13adk4ib7r464gsl4vjhih820bq37ddhqfyfd07wh53a2";
+    sha256 = "sha256-SSdD8dyn6abti8qkd7N5n8EYr5yMW+EPYUnRm7S9CE4=";
   };
 
   nativeBuildInputs = [ cmake pkg-config qttools docbook-xsl-nons ];