Ignore removed changes in license checker

[kachick]

Fixes #154

gh api \
  -H "Accept: application/vnd.github+json" \
  /repos/fastify/fastify-passport/dependency-graph/compare/4b912074ad2273172b65eb44e52201e37583226e...62bdea61e7c137028263b59943de4e65583db760 | jq '.[] | select(.name == "string-similarity")'

{
  "change_type": "removed",
  "manifest": "package-lock.json",
  "ecosystem": "npm",
  "name": "string-similarity",
  "version": "4.0.4",
  "package_url": "pkg:npm/string-similarity@4.0.4",
  "license": "ISC AND MIT",
  "source_repository_url": "https://github.com/aceakash/string-similarity",
  "vulnerabilities": []
}

[febuiles]

Thanks a ton for this @kachick ❤️

[kachick]

Thank you for your reviewing and merging!