Update README.md

README.md

@@ -47,9 +47,9 @@ async fn main() -> Result<()> {
     let preset = EnvPreset::BinanceBtcUsdt1dSma20Sma50;
     
     // Configure I/O to fetch seamlessly from Hugging Face
-    let filename = preset.to_string();
+    let file_stem = preset.to_string();
     let loc = StorageLocation::HuggingFace { version: None };
-    let cfg = IoConfig::new(loc).with_filename(&filename);
+    let cfg = IoConfig::new(loc).with_file_stem(&file_stem);
 
     // Load the environment (downloads and caches locally on first run)
     let mut env = chapaty::load(preset, &cfg)