gollum: 4.1.4 -> 5.0.1

Some changes might require manual migration steps:
"Due to changes to the way in which Gollum handles filenames, you may
have to change some links in your wiki when migrating from gollum 4.x.
See the release notes [0] for more details. You may find the
bin/gollum-migrate-tags script helpful to accomplish this. Also see the
--lenient-tag-lookup option for making tag lookup backwards compatible
with 4.x, though note that this will decrease performance on large wikis
with many tags." (source: [1])

[0]: https://github.com/gollum/gollum/wiki/5.0-release-notes
[1]: https://github.com/gollum/gollum/blob/v5.0.0/HISTORY.md

pkgs/applications/misc/gollum/default.nix

@@ -3,7 +3,7 @@
 
 stdenv.mkDerivation rec {
   pname = "gollum";
-  # nix-shell -p bundix icu zlib
+  # nix-shell -p bundix icu zlib cmake pkg-config openssl
   version = (import ./gemset.nix).gollum.version;
 
   nativeBuildInputs = [ makeWrapper ];
@@ -20,13 +20,16 @@ stdenv.mkDerivation rec {
     mkdir -p $out/bin
     makeWrapper ${env}/bin/gollum $out/bin/gollum \
       --prefix PATH ":" ${stdenv.lib.makeBinPath [ git ]}
+    makeWrapper ${env}/bin/gollum-migrate-tags $out/bin/gollum-migrate-tags \
+      --prefix PATH ":" ${stdenv.lib.makeBinPath [ git ]}
   '';
 
   passthru.updateScript = bundlerUpdateScript "gollum";
 
   meta = with stdenv.lib; {
-    description = "A simple, Git-powered wiki";
-    homepage = https://github.com/gollum/gollum;
+    description = "A simple, Git-powered wiki with a sweet API and local frontend";
+    homepage = "https://github.com/gollum/gollum";
+    changelog = "https://github.com/gollum/gollum/blob/v${version}/HISTORY.md";
     license = licenses.mit;
     maintainers = with maintainers; [ jgillich primeos nicknovitski ];
     platforms = platforms.unix;