Reduce binary size.

--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,5 +29,7 @@
 aho-corasick = "0.7.15"
 
 [profile.release]
-opt-level=3
-lto=true
+codegen-units = 1
+lto = true
+opt-level = "z"
+panic = "abort"