Hi fellas! Currently just trying out features of Llamaindex and I encountered a problem regarding rate limit. I'm currently on a free trial of chatgpt api, so my rate limit is 3 / min. Whenever I try to create SimpleVectorIndex that loads more than approx. 10 .txt files i get this error: INFO:openai:error_code=rate_limit_exceeded error_message='Rate limit reached for default-text-embedding-ada-002 in organization org- on requests per min. Limit: 3 / min. Please try again in 20s. And then it just keeps repeating itself. I get why it is happening, but is there any known way to work around this?