R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'future.tests'

future.tests::future.tests-01-intro |  | future.tests: An Introduction | HTML | source |
future.tests::future.tests-05-ci-github_actions |  | future.tests: Continuous Integration on GitHub Actions | HTML | source |
future.tests::future.tests-05-ci-travis |  | future.tests: Continuous Integration on Travis CI | HTML | source |