message: Add githubPages option to changelog
diff: ### Features
  - Flag option types like `validation` can now be set to true/false to enable/disable all flags within them.
  +- Added `githubPages` option (default: true), which will create a `.nojekyll` page in the generated output.
  +
  +### Thanks!
  +
  +- @srmagura
  ## v0.22.3 (2021-08-12)
  