reduce release binary size

hostnames_allocator/Cargo.toml

@@ -5,9 +5,19 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[profile.release]
+lto = true
+codegen-units = 1
+opt-level = "s"
+strip = true
+
 [dependencies]
 lazy_static = "1.4.0"
-regex = "1.10.2"
+
+[dependencies.regex]
+version = "1.10.2"
+default-features = false
+features = ["std"]
 
 [dev-dependencies]
 itertools = "0.11.0"