Fix -Wunused-parameter

examples/HelloWorld.cpp

@@ -8,11 +8,11 @@ int main() {
 	  .key_file_name = "../misc/key.pem",
 	  .cert_file_name = "../misc/cert.pem",
 	  .passphrase = "1234"
-	}).get("/*", [](auto *res, auto *req) {
+	}).get("/*", [](auto *res, auto */*req*/) {
 	    res->end("Hello world!");
-	}).listen(3000, [](auto *token) {
-	    if (token) {
-		std::cout << "Listening on port " << 3000 << std::endl;
+	}).listen(3000, [](auto *listen_socket) {
+	    if (listen_socket) {
+			std::cout << "Listening on port " << 3000 << std::endl;
 	    }
 	}).run();