Merge pull request #107 from yangby-cryptape/bugfix/override-witnesses #343

Job	Run time
security-audit	3m 3s
linters (ubuntu-latest)	2m 33s
unit-test (ubuntu-latest)	3m 25s
linters (macos-latest)	4m 11s
build-examples (ubuntu-latest)	2m 2s
unit-test (macos-latest)	5m 59s
build-examples (macos-latest)	2m 17s
unit-test (windows-2019)	5m 1s
build-examples (windows-2019)	5m 0s
ci	1s
	33m 32s

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