Update app.py

app.py

@@ -7,7 +7,7 @@ from langchain.embeddings.openai import OpenAIEmbeddings
 from langchain.text_splitter import CharacterTextSplitter
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.vectorstores import Chroma
-from langchain.document_loaders import TextLoader
+from langchain_community.document_loaders import TextLoader
 from langchain.chat_models import ChatOpenAI
 from langchain import PromptTemplate
 from langchain.chains import LLMChain