Update app.py

app.py

@@ -21,7 +21,7 @@ st.image(image, width=1000)
 
 #title
 st.title("Answering questions from scientifc papers")
-st.markdown("##### This tool will allow you to ask questions based on scientific papers.It uses OpenAI's GPT models, and you must have your own API key. Each query is about 10k tokens, which costs about $0.20.")
+st.markdown("##### This tool will allow you to ask questions based on scientific papers. It uses OpenAI's GPT models, and you must have your own API key. Each query is about 10k tokens, which costs about $0.20.")
 st.markdown("##### Current version searches on ArXiv papers only. 🚧Under development🚧")
 st.markdown("Used Libraries:\n * [PaperQA](https://github.com/whitead/paper-qa) \n* [langchain](https://github.com/hwchase17/langchain)")