Reduces binary size from 3.6 MiB to 2.5 MiB.

--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,8 +20,10 @@
 yaml = ["serde_yaml"]
 
 [profile.release]
-lto = "thin"
+lto = true
 panic = "abort"
+codegen-units = 1
+opt-level = "z"
 
 [build-dependencies]
 tera = "1.3.1"
