Compile kahlo package as release even when patina is compiled without optimization.

Cargo.toml

@@ -27,3 +27,7 @@ fontdue = "0.9.0"
 [dev-dependencies]
 serde_json = { version = "1.0" }
 serde = { version = "1.0", features = ["derive"] }
+
+# compile kahlo as a release build even when doing debug builds
+[profile.dev.package.kahlo]
+opt-level = 3