gatsby-cli: throttle the revision bump

[chenrui333]

• Have you followed the guidelines for contributing?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install <formula>)?

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relates to Homebrew/brew#7883

[chenrui333]

Audit failure is expected.

==> brew audit --skip-style gatsby-cli --online --git
==> FAILED
Error: 1 problem in 1 formula detected
gatsby-cli:
  * should only be updated every 10 releases on multiples of 10

[chenrui333]

Merging the PR.