test

feat: enforce blank line following header #4

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Run time

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Job	Run time
Python 3.8 on Linux	15s
Python 3.9 on Linux	15s
Python 3.10 on Linux	14s
Python 3.11 on Linux	17s
Python 3.12 on Linux	16s
Python 3.8 on Windows	54s
Python 3.9 on Windows	34s
Python 3.10 on Windows	35s
Python 3.11 on Windows	44s
Python 3.12 on Windows	58s
Python 3.8 on macOS	47s
Python 3.9 on macOS	13s
Python 3.10 on macOS	13s
Python 3.11 on macOS	13s
Python 3.12 on macOS	14s
	6m 42s