Update app.py

app.py

@@ -12,7 +12,7 @@ Original file is located at
 from PyPDF2 import PdfReader
 from langchain.embeddings.openai import OpenAIEmbeddings
 from langchain.text_splitter import CharacterTextSplitter
-from langchain.vectorstores import ElasticVectorSearch, Pinecone, Weaviate
+from langchain_community.vectorstores import ElasticVectorSearch, Pinecone, Weaviate
 from langchain_community.vectorstores import FAISS
 
 # Get your API keys from openai, you will need to create an account.