v0.0.10
The current ChatCompletion API supports only `parallel_tool_calls=True` or `parallel_tool_calls=NOT_GIVEN` This PR is to support setting `parallel_tool_calls=False`, a common requirement in controlling agent tool use patterns (e.g. ensuring one tool call at the time, to facilitate desired tool calling sequence). I followed the merged [PR#333](https://github.com/openai/openai-agents-python/pull/333) for consistency.