chore(deps): update dependency gh-pages to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
gh-pages	devDependencies	major	^2.0.1 -> ^3.0.0

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Release Notes

tschaub/gh-pages

v3.0.0

Compare Source

Breaking changes:

None really. But tests are no longer run on Node < 10. Development dependencies were updated to address security warnings, and this meant tests could no longer be run on Node 6 or 8. If you still use these Node versions, you may still be able to use this library, but be warned that tests are no longer run on these versions.

All changes:

• #​357 - Dev dependency updates (@​tschaub)
• #​333 - Update readme with command line options (@​Victoire44)
• #​356 - Test as a GitHub action (@​tschaub)
• #​355 - feat(beforeAdd): allow custom script before git add (@​Xiphe)
• #​336 - Fix remove not working properly (@​sunghwan2789)
• #​328 - Update .travis.yml (@​XhmikosR)
• #​327 - Fix typo (@​d-tsuji)

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