[issue39035] Travis CI fail on backports: pyvenv not installed

[Ivan Pozdeev]

Ivan Pozdeev <ivan_pozdeev at mail.ru> added the comment:

While we are at it, shall we enable build config validation (https://docs.travis-ci.com/user/build-config-validation)?

It would produce warnings for outdated keys like this.

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<https://bugs.python.org/issue39035>
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