* generated new diff files covering this sync
* added some helper scripts for the sync process
* fixed RTD theme regression (due to RTD changes since the last release)
Closes#43
* sync with latest typeshed stub file (closes#54)
* publish `dev/mypy.allowlist` in sdist (closes#53)
* drop Python 3.7 support due to positional-only arg
syntax in the updated stub file
* use mypy.stubcheck to ensure stub API matches module API
* sync latest typeshed stub with nullcontext API fix
* use allowlist to ignore deliberately omitted deprecated APIs
