use travis "minimal" vm in the documentation

If not specified, Travis use a system with ruby, which we don't need. We can use the "minimal" one instead.
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Pandark 2019-03-28 14:02:52 +01:00 committed by GitHub
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@ -46,6 +46,8 @@ Make sure "Display value in build log" is off, and then click add. Now Travis ha
We're almost done. We just need some scripts in a .travis.yml file to tell Travis what to do.
```yaml
language: minimal
before_script:
# Download and unzip the zola executable
# Replace the version numbers in the URL by the version you want to use