master ruby upgrade (#24)

* Bump minimal Ruby version to 3.0

* yaml file fix

* yaml for keychain

* Update .travis.yml

Remove ruby version that do not support used syntax

* Update version.rb

set version to 2

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Co-authored-by: vitalie <vitalie@travis-ci.org>
Co-authored-by: Dominik <dominik.alberski@gmail.com>

Dominik avatar Dominik

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