Migration Guide - LiteLLM v1.0.0+

When we have breaking changes (i.e. going from 1.x.x to 2.x.x), we will document those changes here.

`1.0.0`

Last Release before breaking change: 0.14.0

What changed?

Requires openai>=1.0.0
openai.InvalidRequestError → openai.BadRequestError
openai.ServiceUnavailableError → openai.APIStatusError
NEW litellm client, allow users to pass api_key
- litellm.Litellm(api_key="sk-123")
response objects now inherit from BaseModel (prev. OpenAIObject)
NEW default exception - APIConnectionError (prev. APIError)

litellm.get_max_tokens() now returns an int not a dict

max_tokens = litellm.get_max_tokens("gpt-3.5-turbo") # returns an int not a dict 
assert max_tokens==4097

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