add link for whisper large v3 to the readme

There is a new version of Whisper large, called `large-v3`.
I have added a link to it to the model overview table, so new readers are able to directly jump to the most recent version, if they desire.

README.md

@@ -198,6 +198,7 @@ checkpoints are summarised in the following table with links to the models on th
 | medium   | 769 M      | [✓](https://huggingface.co/openai/whisper-medium.en) | [✓](https://huggingface.co/openai/whisper-medium)   |
 | large    | 1550 M     | x                                                    | [✓](https://huggingface.co/openai/whisper-large)    |
 | large-v2 | 1550 M     | x                                                    | [✓](https://huggingface.co/openai/whisper-large-v2) |
+| large-v3 | 1550 M     | x                                                    | [✓](https://huggingface.co/openai/whisper-large-v3) |
 
 # Usage