Update configuration.haml for #scss exclude example
Update configuration.haml for #scss exclude example

I tried the existing example, and it doesn't work to exclude options. If I remove the `scss:` line in the `.scss-style.yml` file, it does work. Cross-confirmed with an example in the linter documentation:

https://github.com/brigade/scss-lint#configuration
brgaulin/hound,platanus/hound,platanus/hound,houndci/hound,houndci/hound,thoughtbot/hound,brgaulin/hound,thoughtbot/hound,platanus/hound,brgaulin/hound,platanus/hound,thoughtbot/hound,brgaulin/hound,houndci/hound,houndci/hound,thoughtbot/hound