fix link

app.py

@@ -3,7 +3,7 @@ import gradio as gr
 title = "GPT"
 description = "Gradio Demo for OpenAI GPT. To use it, simply add your text, or click one of the examples to load them. Read more at the links below."
 
-article = "<p style='text-align: center'><a href='https://arxiv.org/abs/1909.05858' target='_blank'>Improving Language Understanding by Generative Pre-Training</a></p>"
+article = "<p style='text-align: center'><a href='https://cdn.openai.com/research-covers/language-unsupervised/language_understanding_paper.pdf' target='_blank'>Improving Language Understanding by Generative Pre-Training</a></p>"
 
 examples = [
     ['Paris is the capital of']