Update requirements.txt

requirements.txt

@@ -1,8 +1,7 @@
-
-llama-index-core
-llama-index-llms-openai
-llama-index-llms-replicate
-llama-index-embeddings-huggingface
-llama-index-readers-file
-llama-index-embeddings-openai
-pdfplumber
+llama-index-core>=0.3.4
+llama-index-llms-openai>=0.2.0
+llama-index-llms-replicate>=0.2.0
+llama-index-embeddings-huggingface>=0.2.0
+llama-index-readers-file>=0.2.0
+llama-index-embeddings-openai>=0.2.0
+pdfplumber>=0.9.0