Reduce binary size

- Adjust `Cargo.toml` to reduce binary size in `release` pofile

Cargo.toml

@@ -4,3 +4,10 @@ members = [
     "owm_widg_config", "weatherd",
     "widget",
 ]
+
+[profile.release]
+lto = "thin"
+codegen-units = 1
+strip = "symbols"
+opt-level = "z"
+panic = "abort"