fix(changelog): fix previous version links #766

Job	Run time
Test fixtures (test-ignore-tags)	2m 18s
Test fixtures (test-topo-order, --latest)	2m 12s
Test fixtures (test-date-order, --latest)	2m 13s
Test fixtures (test-topo-order-arg, --latest --topo-order)	2m 15s
Test fixtures (test-latest-with-one-tag, --latest)	2m 11s
Test fixtures (test-commit-footers)	2m 16s
Test fixtures (test-commit-preprocessors)	2m 17s
Test fixtures (test-custom-scope)	2m 18s
Test fixtures (test-limit-commits)	2m 22s
Test fixtures (test-skip-breaking-changes)	2m 16s
Test fixtures (test-split-commits)	2m 15s
Test fixtures (test-keep-a-changelog-links)	2m 12s
Test fixtures (test-keep-a-changelog-links-current-arg, --current)	2m 12s
Test fixtures (test-keep-a-changelog-links-current-arg, --latest)	2m 14s
Test fixtures (test-keep-a-changelog-links-latest-arg, --latest)	2m 11s
Test fixtures (test-keep-a-changelog-links-no-tags)	2m 20s
Test fixtures (test-keep-a-changelog-links-no-tags, --unreleased)	2m 14s
Test fixtures (test-keep-a-changelog-links-no-tags, --latest)	2m 17s
Test fixtures (test-keep-a-changelog-links-no-tags, --current)	2m 18s
Test fixtures (test-keep-a-changelog-links-one-tag)	2m 12s
Test fixtures (test-keep-a-changelog-links-tag-arg, --tag 0.3.0)	2m 21s
Test fixtures (test-keep-a-changelog-links-unreleased-arg, --unreleased)	2m 14s
Test fixtures (test-keep-a-changelog-links-unreleased-arg, --latest --unreleased)	2m 18s
	51m 56s

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