Update app.py

app.py

@@ -23,6 +23,8 @@ from langchain.chains import ConversationalRetrievalChain
 from langchain.callbacks import get_openai_callback
 from langchain import PromptTemplate
 from langchain import LLMChain
+import monkey_patch     # OBS: esse arquivo evita um bug frequente do pytube
+from pytube import YouTube
 openai_api_key = os.getenv("openai_api_key")