Add anyhow and configurable TcpListener

- add anyhow to Cargo.toml
- make the connection parameter (for the TcpListener) configurable

src/config.rs

@@ -7,6 +7,7 @@ use serde_derive::Deserialize;
 
 #[derive(Deserialize, Debug)]
 pub struct HuskConfig {
+    pub connection: String,
     logfile_config: Option<String>,
 }