Had to do this to get it to work (#55)

* private key or else we get error no auth

* Otherwise -p always gives Hello world!

README.md

@@ -99,7 +99,7 @@ Google has
 frontend to receive notifications.
 
 Store the subscription info to `examples/test.json` and send a notification with
-`cargo run --example simple_send -- -f examples/test.json -p "It works!"`.
+`cargo run --example simple_send -- -v ./private_key.pem -f examples/test.json -p "It works!"`.
 
 Overview
 --------

examples/simple_send.rs

@@ -58,6 +58,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync + 'static>
 
     if let Some(ref payload) = push_payload {
         builder.set_payload(ece_scheme, payload.as_bytes());
+    } else {
+        builder.set_payload(ece_scheme, "Hello world!".as_bytes());
     }
 
     if let Some(time) = ttl {
@@ -76,7 +78,6 @@ async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync + 'static>
         let signature = sig_builder.build().unwrap();
 
         builder.set_vapid_signature(signature);
-        builder.set_payload(ContentEncoding::Aes128Gcm, "test".as_bytes());
     };
 
     let client = IsahcWebPushClient::new()?;