Fix a payload decode

Resume doesn't have a heartbeat_interval, so don't try to decode it.

src/client/gateway/shard.rs

@@ -494,13 +494,8 @@ impl Shard {
         let _ = self.keepalive_channel.send(GatewayStatus::SendMessage(msg));
     }
 
+    #[allow(unused_variables)]
     fn handle_dispatch(&mut self, event: &Event) {
-        if let Event::Resumed(ref ev) = *event {
-            let status = GatewayStatus::Interval(ev.heartbeat_interval);
-
-            let _ = self.keepalive_channel.send(status);
-        }
-
         #[cfg(feature="voice")]
         {
             if let Event::VoiceStateUpdate(ref update) = *event {

src/model/event.rs

@@ -720,7 +720,6 @@ impl RelationshipRemoveEvent {
 
 #[derive(Clone, Debug)]
 pub struct ResumedEvent {
-    pub heartbeat_interval: u64,
     pub trace: Vec<Option<String>>,
 }
 
@@ -729,7 +728,6 @@ impl ResumedEvent {
     #[inline]
     pub fn decode(mut map: Map) -> Result<Self> {
         Ok(ResumedEvent {
-            heartbeat_interval: req!(remove(&mut map, "heartbeat_interval")?.as_u64()),
             trace: remove(&mut map, "_trace").and_then(|v| decode_array(v, |v| Ok(into_string(v).ok())))?,
         })
     }