Change: docgen to not change output needlessly

If the output file wouldn't change, then don't update it.

This is imperfect, since it still needs to produce the output file,
so it can spend a bit of processing power to make no changes. But the
alternative would be to make needless changes.

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 6ade64d..52e3f17 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,6 +28,7 @@ serde = { version = "1.0.101", features = ["derive"] }
 chrono = "0.4"
 thiserror = "1"
 anyhow = "1"
+file_diff = "1"
 
 [dependencies.tera]
 version = "1"