fix: restore type

src/lib.rs

@@ -63,7 +63,7 @@ pub async fn ask(prompt: &str) -> Result<Vec<Delta>, Box<dyn std::error::Error>>
         if line == "" {
             continue;
         }
-        let delta:  = serde_json::from_str(&line).unwrap();
+        let delta:  Delta = serde_json::from_str(&line).unwrap();
         deltas.push(delta);
     }