chore: remove GPL code (#293) #601

Job	Run time
Test fixtures (test-ignore-tags)	4m 26s
Test fixtures (test-topo-order, --latest)	3m 23s
Test fixtures (test-date-order, --latest)	3m 22s
Test fixtures (test-topo-order-arg, --latest --topo-order)	4m 20s
Test fixtures (test-latest-with-one-tag, --latest)	3m 22s
Test fixtures (test-commit-footers)	3m 40s
Test fixtures (test-commit-preprocessors)	3m 18s
Test fixtures (test-custom-scope)	3m 22s
Test fixtures (test-limit-commits)	3m 30s
Test fixtures (test-skip-breaking-changes)	3m 21s
Test fixtures (test-split-commits)	3m 25s
Test fixtures (test-keep-a-changelog-links)	4m 21s
	43m 50s

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