Feat/add gemini (#349)

Author: drewpayment

README.md

@@ -110,7 +110,7 @@ OCO_TOKENS_MAX_OUTPUT=<max response tokens (default: 500)>
 OCO_OPENAI_BASE_PATH=<may be used to set proxy path to OpenAI api>
 OCO_DESCRIPTION=<postface a message with ~3 sentences description of the changes>
 OCO_EMOJI=<boolean, add GitMoji>
-OCO_MODEL=<either 'gpt-4', 'gpt-4-turbo', 'gpt-3.5-turbo' (default), 'gpt-3.5-turbo-0125', 'gpt-4-1106-preview', 'gpt-4-turbo-preview' or 'gpt-4-0125-preview'>
+OCO_MODEL=<either 'gpt-4o', 'gpt-4', 'gpt-4-turbo', 'gpt-3.5-turbo' (default), 'gpt-3.5-turbo-0125', 'gpt-4-1106-preview', 'gpt-4-turbo-preview' or 'gpt-4-0125-preview'>
 OCO_LANGUAGE=<locale, scroll to the bottom to see options>
 OCO_MESSAGE_TEMPLATE_PLACEHOLDER=<message template placeholder, default: '$msg'>
 OCO_PROMPT_MODULE=<either conventional-commit or @commitlint, default: conventional-commit>