README: update information on GPT-4

CONTRIBUTING.md

@@ -3,7 +3,7 @@
 ## How to Add a New API
 
 ### Add POJOs to API library
-I usually have ChatGPT write them for me by copying and pasting from teh OpenAI API reference ([example chat](https://chat.openai.com/share/af48ef11-0354-40b2-a8e2-3bf8e93a94a3)), but double check everything because Chat always makes mistakes, especially around adding `@JsonProperty` annotations.
+I usually have ChatGPT write them for me by copying and pasting from the OpenAI API reference ([example chat](https://chat.openai.com/share/af48ef11-0354-40b2-a8e2-3bf8e93a94a3)), but double check everything because Chat always makes mistakes, especially around adding `@JsonProperty` annotations.
 
 - Make all java variables camel case, and use `@JsonProperty` for fields that OpenAI returns as snake case
 - Include comments for each variable, I take these directly from the OpenAI website

README.md

@@ -185,8 +185,8 @@ Or functions with 'stream' mode enabled:
 
 ## FAQ
 ### Does this support GPT-4?
-Yes! GPT-4 uses the ChatCompletion Api, and you can see the latest model options [here](https://platform.openai.com/docs/models/gpt-4).  
-GPT-4 is currently in a limited beta (as of 4/1/23), so make sure you have access before trying to use it.
+Yes! GPT-4 uses the ChatCompletion Api, and you can see the latest model options [here](https://platform.openai.com/docs/models/gpt-4-turbo-and-gpt-4).  
+Please note that GPT-4 is available to paying customers only! This [article](https://help.openai.com/en/articles/7102672-how-can-i-access-gpt-4) has details on how to access GPT-4.
 
 ### Does this support functions?
 Absolutely! It is very easy to use your own functions without worrying about doing the dirty work.