Bump html-proofer from 3.17.0 to 3.18.0

Bumps html-proofer from 3.17.0 to 3.18.0.

Commits

fff1bd8 3.18.0
a7f6ccd Merge pull request #609 from gjtorikian/calmer-error
fea77d0 Capture errors
5a4afd2 Install deps first
49ad675 Lint
29d316d Never needed to raise
e09f6be :gem: bump to 3.17.4
a830821 Merge pull request #605 from gjtorikian/cache-crash
ef4eafa Correct internal links when pulled from outdated cache
21b0edd :gem: bump to 3.17.3
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open-education-polito / org-website

Bump html-proofer from 3.17.0 to 3.18.0 #42