Sample sass-lint.yml should contain explicit examples

[lozandier]

The readme shows rules with configuration options be set in example like the following code snippet, but does not does so in the sample .sass-lint.yml:

indentation:
  - 2
  -
    size: 2

It seems reasonable that rules such as quotes and indentation—rules commonly needed to be configured explicitly through options be done in the .sass-lint.yml file to reinforce this being done.

Noticed devs less experienced with YAML files & sass-lint I know were confused when they were getting output such as the following screenshot with their attempts of using gulp-sass-lint for the first time I've emulated:

[Snugug]

We can improve the documentation to include a proper sample config file instead of pointing to our defaults, but I'm not going to add explicit configuration to the defaults as I want to ensure that that is defined in each rule.

[lozandier]

That's an understandable stance to me.