Update app.py

app.py

@@ -10,7 +10,7 @@ from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.llms import OpenAI
 from langchain.chains import RetrievalQA
 from langchain.chains import VectorDBQA
-from langchain.document_loaders import TextLoader
+from langchain.document_loaders import TextLoader, WebBaseLoader
 from langchain.document_loaders import UnstructuredFileLoader
 from flask import Flask, jsonify, render_template, request
 from werkzeug.utils import secure_filename