95487b055328b590ba83f258de9637ab0f9a2f17 doc: Drop mentions of Travis CI as it is no longer used (Hennadii Stepanov)
09d105ef0f8b4b06bf248721a1209c9e16e9db75 ci: Drop travis_fold feature as Travis CI is no longer used (Hennadii Stepanov)
Pull request description:
As Travis CI is no longer used, this PR:
- drops `travis_fold` feature
- drops mentions of Travis CI in docs
ACKs for top commit:
MarcoFalke:
ACK 95487b055328b590ba83f258de9637ab0f9a2f17
Tree-SHA512: 2e259bb8b1e37bcefc1251737bb2716f06ddb57c490010b373825c4e70f42ca38efae69a2f63f21f577d7cee3725b94097bdddbd313f8ebf499281cf97c53cef