Update README.md

Add training date.

README.md

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 # Model Card for Alfred-40B-0723
 
 `Alfred-40B-0723` is a finetuned version of [Falcon-40B](https://huggingface.co/tiiuae/falcon-40b), obtained with Reinforcement Learning from Human Feedback (RLHF).
-It is the first of a series of RLHF models based on Falcon-40B that will be regularly released. It is made available under the Apache 2.0 License.
+It is the first of a series of RLHF models based on Falcon-40B that will be regularly released. It is made available under the Apache 2.0 License. The model was trained in July 2023 (`0723`).
 
 ## Model Details