docs(README.md): add GPT-4 usage instructions and mention the cost difference compared to GPT-3.5-turbo

2023-04-28 15:35:40 +08:00
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 ## Features

+### Switch to GPT-4
+
+By default OpenCommit uses GPT-3.5-turbo (ChatGPT).
+
+You may switch to GPT-4 which performs better, but costs ~x15 times more 🤠
+
+```sh
+oc config set model=gpt-4
+```
+
+Make sure you do lowercase `gpt-4`.
+
 ### Preface commits with emoji 🤠

 [GitMoji](https://gitmoji.dev/) convention is used.