$ mdx-site/page.mdx --max-grade 6
[exit 0]
--- stdout
mdx-site/page.mdx  ·  Grade 3, easy to read
  PASS  grade 3.3 is within --max-grade 6

  No flagged sentences or words.
  mean of ARI 3.7, FK 2.4, Fog 3.8 · 6 sentences
--- stderr

