goattracker,goattracker-stereo: 2.75 -> 2.76, 2.76 -> 2.77

pkgs/applications/audio/goattracker/default.nix

···
 in stdenv.mkDerivation rec {
   inherit pname;
   version = if isStereo
-    then "2.76"  # stereo
-    else "2.75"; # normal
+    then "2.77"  # stereo
+    else "2.76"; # normal
 
   src = fetchurl {
     url = "mirror://sourceforge/goattracker2/GoatTracker_${version}${optionalString isStereo "_Stereo"}.zip";
     sha256 = if isStereo
-      then "12cz3780x5k047jqdv69n6rjgbfiwv67z850kfl4i37lxja432l7"  # stereo
-      else "1km97nl7qvk6qc5l5j69wncbm76hf86j47sgzgr968423g0bxxlk"; # normal
+      then "1hiig2d152sv9kazwz33i56x1c54h5sh21ipkqnp6qlnwj8x1ksy"  # stereo
+      else "0d7a3han4jw4bwiba3j87racswaajgl3pj4sb5lawdqdxicv3dn1"; # normal
   };
-  sourceRoot = (if isStereo then "gt2stereo/trunk" else "goattrk2") + "/src";
+  sourceRoot = "src";
 
   nativeBuildInputs = [ copyDesktopItems unzip imagemagick ];
   buildInputs = [ SDL ];