Updating an existing GitHub authorization via HTTP PATCH to public_repo only (e.g. prose.io, which defaults to the more permissive "repo").

patch-github-oauth.txt

# List your authorizations (substituting your own GitHub username for <user>)

  curl -u <user> https://api.github.com/authorizations

# Update the scope of a specific authorization (substitute a specific id for <id>) to "public_repo"

  curl -u <user> --request PATCH https://api.github.com/authorizations/<id> --header "Content-Type:application/json" --data '{"scopes":["public_repo"]}'

# Reference: http://developer.github.com/v3/oauth/#oauth-authorizations-api