fix: default model url

plwn/download.py

@@ -10,7 +10,7 @@ config.read(config_path)
 
 
 def download(name="default_model"):
-    url = config["DOWNLOAD"]
+    url = config["DOWNLOAD"][name]
     r = requests.get(url)
     with open(name, "wb") as f:
         f.write(r.content)