Update tool_config.json

tool_config.json

@@ -2,6 +2,6 @@
   "description": "This is a tool that downloads a file from a `url`. It takes the `url` as input, and returns the text contained in the file.",
   "name": "text_downloader",
   "tool_class": "text_download.TextDownloadTool",
-  "inputs": {"url": "str"},
+  "inputs": {"url": {"type": "str", "description": "url to download file from"}},
   "output_type": "str"
 }