fix(deps): update dependency gh-pages to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gh-pages	3.2.3 -> 4.0.0

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Release Notes

tschaub/gh-pages

v4.0.0

Compare Source

This release doesn't include any breaking changes, but due to updated development dependencies, tests are no longer run on Node 10.

• #​432 - Updated dev dependencies and formatting (@​tschaub)
• #​430 - Bump ansi-regex from 3.0.0 to 3.0.1 (@​tschaub)
• #​431 - Bump path-parse from 1.0.6 to 1.0.7 (@​tschaub)
• #​427 - Bump async from 2.6.1 to 2.6.4 (@​tschaub)
• #​423 - Bump minimist from 1.2.5 to 1.2.6 (@​tschaub)

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