build

Refactor readme, changelog + use SPDF license identifier #44

Job	Run time
Test debug build on Ubuntu --warning-as-error --debug	45s
Test on ubuntu-latest x64 --warning-as-error	43s
Test debug build on Ubuntu --warning-as-error --debug --multi-phase-init	46s
Test on ubuntu-latest x64 --warning-as-error --multi-phase-init	34s
Build sdist	0s
Test on ubuntu-latest x64 --warning-as-error --cffi	40s
Build wheels for ${{ matrix.arch }} (skip ${{ matrix.skip_image }})	0s
Test on macos-latest x64 --warning-as-error	56s
Build wheels on ${{ matrix.platform }}	0s
Test on macos-latest x64 --warning-as-error --multi-phase-init	50s
Test on ${{ matrix.distro }} ${{ matrix.arch }}	0s
Test on macos-latest x64 --warning-as-error --cffi	51s
Test on pypy-3.8	26s
Test on pypy-3.9	26s
Test on windows-latest x64 --warning-as-error	1m 6s
Test on windows-latest x64 --warning-as-error --multi-phase-init	1m 29s
Test on pypy-3.10	25s
Test on windows-latest x64 --warning-as-error --cffi	1m 30s
Test on windows-latest x86 --warning-as-error	1m 38s
Test on windows-latest x86 --warning-as-error --multi-phase-init	1m 39s
Test on windows-latest x86 --warning-as-error --cffi	1m 34s
Publish to PyPI	0s
	16m 18s

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