chronograf 1.3.1.0

[goller]

• 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?
• Does your build pass brew audit --strict <formula> (after doing brew install <formula>)?

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[dunn]

@BrewTestBot test this please

[dunn]

Thank you for contributing! Merged as 1a1c055.

[goller]

Thank you, @dunn !