Explicitly specify name of README file so twine works. #202

Job	Run time
Test (windows-latest, 3.8)	1m 48s
Test (ubuntu-20.04, 3.8)	37s
Test (windows-latest, 3.9)	1m 5s
Test (macos-latest, 3.8)	53s
Test (ubuntu-20.04, 3.9)	37s
Test (windows-latest, 3.10)	1m 36s
Test (macos-latest, 3.9)	27s
Test (ubuntu-20.04, 3.10)	36s
Test (windows-latest, 3.11)	1m 37s
Test (ubuntu-20.04, 3.11)	30s
Test (macos-latest, 3.10)	40s
Test (windows-latest, 3.12)	1m 36s
Test (ubuntu-20.04, 3.12)	43s
Test (macos-latest, 3.11)	32s
Test (windows-latest, 3.13-dev)	2m 34s
Test (macos-latest, 3.12)	34s
Test (ubuntu-20.04, 3.13-dev)	50s
Test (windows-latest, pypy-3.8)	1m 49s
Test (macos-latest, 3.13-dev)	47s
Test (ubuntu-20.04, pypy-3.8)	39s
Test (windows-latest, pypy-3.9)	1m 30s
Test (macos-latest, pypy-3.8)	36s
Test (ubuntu-20.04, pypy-3.9)	42s
Test (windows-latest, pypy-3.10)	1m 22s
Test (macos-latest, pypy-3.9)	37s
Test (ubuntu-20.04, pypy-3.10)	43s
Test (macos-latest, pypy-3.10)	36s
Build source distribution	4s
Build wheels (3.8+) on ubuntu-20.04 for auto	3m 21s
Build wheels (3.8+) on windows-latest for auto	6m 6s
Build wheels (3.8+) on macos-latest for auto	2m 21s
Build wheels (3.8+) on ubuntu-20.04 for aarch64	7m 36s
Build wheels (3.8+) on macos-latest for arm64	2m 45s
	48m 49s

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