Support http inbound

resolves #2

src/config_models/mod.rs

@@ -165,7 +165,7 @@ pub struct Inbound {
     pub listen: String,
     pub port: u16,
     pub protocol: String,
-    pub settings: InboundSettings,
+    pub settings: Option<InboundSettings>,
     pub sniffing: Option<SniffingSettings>,
     pub tag: String,
 }