Use standard library for date and time when possible

Bump version: 4.3.1 → 4.3.2

update changelog

Reformat using newer version of black.

Avoid potential AttributeError in httpx version check

Correct httpx version comparison

Update proxy argument in httpx Client/AsyncClient

Bump version: 4.3.0 → 4.3.1

Fix regression in parsing xsd:Date with negative timezone

[FIX] No visitor defined for '{http://www.w3.org/2001/XMLSchema}notation'

Create SECURITY.md

fix release steps for pyproject.toml

Add sponsors section

Bump version: 4.2.1 → 4.3.0

update bumpversion config for pyproject.toml