mypy fix, refs simonw#601

Release 0.17

Refs simonw#587, simonw#590, simonw#591

Release 0.17a0

Refs simonw#587, simonw#590

Release notes for 0.16

Release 0.15

Refs simonw#515, simonw#525, simonw#536, simonw#537

gpt-4-turbo model ID, closes simonw#493

Windows readline fix, plus run CI against macOS and Windows

* Run CI on Windows and macOS as well as Ubuntu, refs simonw#407
* Use pyreadline3 on win32
* Back to fail-fast since we have a bigger matrix now
* Mark some tests as xfail on windows

Release 0.13

Refs simonw#325, simonw#351, simonw#373, simonw#376, simonw#394, simonw#396, simonw#397, simonw#404

Closes simonw#402

Release 0.12

Refs simonw#323, simonw#324

Release 0.11.2

Refs simonw#327