Making sure the kit works with private repositories

[rudyrigot]

There were some changes recently on the API side, but maybe this doesn't change anything, and the kit works great. To be checked.

[ornicar]

I fixed it and tested it yesterday

• https://github.com/prismicio/scala-kit/commit/cf8fa2bb90b2fb7c3fe08a79bca701b946bb9082
• https://github.com/prismicio/scala-kit/commit/f97f5db73ba9ca9eb93bda69bc1ecf088546cf7b