Improve error messages

src/main.rs

@@ -146,7 +146,7 @@ fn main() {
                 url.set_query(Some(&encoded.to_string()));
             },
             e => {
-                eprintln!("Received error status {}", e);
+                eprintln!("Received error status {} ({:?})", e, e);
                 std::process::exit(1);
             }
         }
@@ -164,7 +164,7 @@ fn main() {
                 }
             }
         }
-        mime => {
+        _ => {
             eprintln!("Unsupported mime type {}", mime);
             std::process::exit(1);
         }