v1.4.0 GPT-4 Turbo release support

What's Changed

• Try to parse all answers as markdown by @ijwfly in #27
• Fix handling of long voice messages by @ijwfly in #28
• GPT 4 Turbo+Vision release support by @ijwfly in #29

Known issues

• Old messages with images will cause error. Workaround: just forward these messages from bot to bot and forwarded messages will work.

Something went wrong:
<class 'openai.BadRequestError'>
Error code: 400 - {'error': {'message': "Invalid type for 'messages[3].content[1].image_url': expected an object, but got a string instead.", 'type': 'invalid_request_error', 'param': 'messages[3].content[1].image_url', 'code': 'invalid_type'}}

• Image processing attempt after function calling fails with error. This issue appears to be caused by an anomaly on OpenAI's side. I assume this error will be fixed after transition from function calling api to tool calling api.

Something went wrong:
<class 'openai.BadRequestError'>
Error code: 400 - {'error': {'message': 'Invalid chat format. Unexpected keys in messages.', 'type': 'invalid_request_error', 'param': None, 'code': None}}

UPD: openai fixed this issue on their side

Full Changelog: v1.3.0...v1.4.0