v0.18.0

• Update package.json (f2fea79)
• Add release-it (5f4b37d)
• Fix tests (ecceb7c)
• Merge branch 'tag-commit-date' into commits-by-branch (d699db7)
• Fix tests (718b9ae)
• Merge branch 'missing-prs' into tag-commit-date (2715499)
• Correctly compare dates for PR retrieval; fix tests (0b306da)
• Track PRs, commits by branch, not date (acef232)
• Use commit date as tag date (ed9fc74)
• Correctly compare dates for PR retrieval (e53f9e7)
• Update supported NodeJS versions to current (github-tools#291) (ff0ddae)
• docs: add viatrix as a contributor (github-tools#297) (8beb6f0)
• Return exit code 1 on error for gren changelog (github-tools#294) (69b7766)
• Bump lodash from 4.17.15 to 4.17.19 (github-tools#275) (305e5c6)
• Bump node-fetch from 1.7.3 to 2.6.1 (github-tools#280) (8b94c98)
• Add group post processor (github-tools#286) (458289f)
• Fix failing test (github-tools#281) (6734707)
• fix: index out of range bug (github-tools#289) (62c9289)