Prepare 0.0.19 release (openai#895) 

v0.0.18 (openai#878) 

v0.0.17 (openai#809) bump version

v0.0.16 (openai#733) 

v0.0.15 (openai#701) 

0.0.14 release (openai#635) 

v0.0.13 (openai#593) 

v0.0.12 (openai#564) 

v0.0.11 (openai#520) New release, to incorporate openai#519

Support parallel_tool_calls=False for ChatCompletion API (openai#513) 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](openai#333) for consistency.