print support in basic example

Author: avitex

examples/basic.rs

@@ -1,5 +1,7 @@
 #[tokio::main]
 async fn main() {
+    println!("builtin support: {:?}", public_ip::support());
+
     // Attempt to get an IP address and print it.
     if let Some(ip) = public_ip::addr().await {
         println!("public ip address: {:?}", ip);