Bump version to 0.6.0 #8

Job	Run time
build-package	38s
lint	42s
unit-test (3.10, macos-latest)	35s
unit-test (3.10, ubuntu-latest)	21s
unit-test (3.10, windows-latest)	50s
unit-test (3.11, macos-latest)	21s
unit-test (3.11, ubuntu-latest)	21s
unit-test (3.11, windows-latest)	50s
unit-test (3.12, macos-latest)	22s
unit-test (3.12, ubuntu-latest)	26s
unit-test (3.12, windows-latest)	1m 15s
unit-test (3.7, ubuntu-latest)	23s
unit-test (3.8, macos-latest)	46s
unit-test (3.7, windows-latest)	1m 10s
unit-test (3.8, ubuntu-latest)	24s
unit-test (3.8, windows-latest)	1m 3s
unit-test (3.9, macos-latest)	40s
unit-test (3.9, ubuntu-latest)	24s
unit-test (3.9, windows-latest)	56s
unit-test (pypy-3.10, macos-latest)	1m 4s
unit-test (pypy-3.10, ubuntu-latest)	54s
unit-test (pypy-3.10, windows-latest)	2m 2s
publish-package	32s
sign-package	18s
	17m 17s

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