retroarch: add changelog

pkgs/misc/emulators/retroarch/default.nix

@@ -113,6 +113,7 @@ stdenv.mkDerivation rec {
     description = "Multi-platform emulator frontend for libretro cores";
     license = licenses.gpl3Plus;
     platforms = platforms.unix;
+    changelog = "https://github.com/libretro/RetroArch/blob/v${version}/CHANGES.md";
     maintainers = with maintainers; [ MP2E edwtjo matthewbauer kolbycrouch thiagokokada ];
     # FIXME: exits with error on macOS:
     # No Info.plist file in application bundle or no NSPrincipalClass in the Info.plist file, exiting

pkgs/misc/emulators/retroarch/wrapper.nix

@@ -28,10 +28,10 @@ stdenv.mkDerivation {
   preferLocalBuild = true;
 
   meta = with retroarch.meta; {
-    inherit license homepage platforms maintainers;
+    inherit changelog license homepage platforms maintainers;
     description = description
-                  + " (with cores: "
-                  + lib.concatStringsSep ", " (map (x: ""+x.name) cores)
-                  + ")";
+      + " (with cores: "
+      + lib.concatStringsSep ", " (map (x: "${x.name}") cores)
+      + ")";
   };
 }