fix gpt ascii

src/commands/gpt.rs

@@ -253,7 +253,12 @@ fn save_record(did: &str, collection: &str, rkey: &str, record: &Record) -> Resu
         "cid": record.cid,
         "value": record.value,
     });
-    fs::write(&path, serde_json::to_string_pretty(&json)?)?;
+    let formatter = serde_json::ser::PrettyFormatter::with_indent(b"  ");
+    let mut buf = Vec::new();
+    let mut ser = serde_json::Serializer::with_formatter(&mut buf, formatter);
+    use serde::Serialize;
+    json.serialize(&mut ser)?;
+    fs::write(&path, String::from_utf8(buf)?)?;
     println!("Saved: {}", path.display());
 
     Ok(())