build bot access keys should not be saved public for security reasons.
(didnt find a proper mail adress to contact you)
85e0cfb

Once these are removed it would be good to regenerate these tokens because they'll be in git history forever.

These access keys are encrypted, so are safe to disclose publicly. See here for details: https://docs.travis-ci.com/user/environment-variables/#defining-encrypted-variables-in-travisyml