Update app.py

Correcting output of webpage contents to be bytes

app.py

@@ -24,7 +24,7 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
 
 # Creating an example function to get data from a website of my choice
 @tool
-def webpage_contents_get(url:str, headers_in: dict = None)-> str: #it's import to specify the return type
+def webpage_contents_get(url:str, headers_in: dict = None)-> bytes: #it's import to specify the return type
     #Keep this format for the description / args / args description but feel free to modify the tool
     """A simple function to grab contents of a webpage.  As this is very long and not easily interpretable,
     summaries based on other tools applied to this content should be returned to users with questions.