change copyright year from year range to starting year #157

Job	Run time
build_windows (3.9)	29m 51s
build_linux (3.9)	2m 18s
build_windows (3.10)	22m 14s
build_linux (3.10)	2m 34s
test_linux (3.9, 1.26*, false, ubuntu-latest)	2s
test_linux (3.10, 1.26*, false, ubuntu-latest)	4s
test_windows (3.9, 1.26*, false, windows-2019)	5s
test_windows (3.10, 1.26*, false, windows-2019)	5s
	57m 13s

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