Streaming end is not fully OpenAI compatible. [DONE\n] message missing newline

[AlexanderZhk]

Noticed this behaviour in the CodeGPT plugin (https://github.com/appleboy/CodeGPT) when using with pipelines:

The issue is that the openai implementation "newlines" the final bracket ("]") in the [DONE\n] message.
Like this:

However, in the pipelines implementation, the [DONE\n] message does not have the newline character:

pipelines/main.py

Line 734 in c1dd898

yield f"data: [DONE]"

Changing this line to yield f"data: [DONE\n]" would increase the openai compatibility of Pipelines.

Tested with the CodeGPT plugin - works correctly with this change.