Update app.py

app.py

@@ -20,7 +20,7 @@ tokenizer = BartTokenizer.from_pretrained("facebook/bart-large-cnn")
 
 # Defining a function to read in the text file
 def read_in_text(url):
-  with open(URL, "r") as file:
+  with open(url, "r") as file:
     article = file.read()
       
     return article