chore: Update flake.nix and flake.lock with html-tidy etc.

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
index 29c7d08..b8c244f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -27,6 +27,7 @@
             librsvg
             (python3.withPackages test-python-packages)
             black
+            html-tidy
           ];
           SUBPLOT_DOT_PATH = "${pkgs.graphviz}/bin/dot";
           SUBPLOT_JAVA_PATH = "${pkgs.jre}/bin/java";