prepare to release 0.31 #721

Job	Run time
cwl-utils release test	2m 46s
CI linters via Tox (lint-readme)	34s
CI linters via Tox (pydocstyle)	18s
CI tests via Tox (3, 8, lint)	24s
CI tests via Tox (3, 8, unit)	2m 51s
CI tests via Tox (3, 8, bandit)	43s
CI tests via Tox (3, 8, mypy)	1m 10s
CI tests via Tox (3, 9, lint)	36s
CI tests via Tox (3, 9, unit)	1m 31s
CI tests via Tox (3, 9, bandit)	30s
CI tests via Tox (3, 9, mypy)	1m 12s
CI tests via Tox (3, 10, lint)	41s
CI tests via Tox (3, 10, unit)	2m 4s
CI tests via Tox (3, 10, bandit)	30s
CI tests via Tox (3, 10, mypy)	50s
CI tests via Tox (3, 11, lint)	40s
CI tests via Tox (3, 11, unit)	2m 11s
CI tests via Tox (3, 11, bandit)	27s
CI tests via Tox (3, 11, mypy)	41s
CI tests via Tox (3, 12, lint)	41s
CI tests via Tox (3, 12, unit)	2m 49s
CI tests via Tox (3, 12, bandit)	36s
CI tests via Tox (3, 12, mypy)	1m 22s
	26m 7s

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