chore: change visibility of default change builder to be public #341

Job	Run time
security-audit	3m 11s
linters (ubuntu-latest)	2m 32s
build-examples (ubuntu-latest)	2m 1s
unit-test (ubuntu-latest)	3m 33s
linters (macos-latest)	1m 58s
build-examples (macos-latest)	5m 18s
unit-test (macos-latest)	5m 22s
build-examples (windows-2019)	5m 44s
unit-test (windows-2019)	5m 37s
ci	1s
	35m 17s

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