Minimize size of the binary.

--- a/Cargo.toml
+++ b/Cargo.toml
@@ -77,6 +77,8 @@
 [profile.release]
 lto = true # link time optimization - roughly halves the size of the exec
 codegen-units = 1 # this removes a few hundred bytes from the final exec size
+opt-level = "z"
+panic = "abort"
 
 [[bench]]
 name = "fuzzy"