Support build tools such as gulp-standard

[webdevian]

Sometimes standard is included in a project as a child dependency so it won't be listed in package.json.

For instance, I use gulp-standard for my linting, but don't have standard as a separate dependency because I don't want to keep 2 versions in sync.

[sonicdoe]

I’d rather not lint if standard is installed as a sub-dependency. I think the package author should make an explicit decision in the top-level package.json if the project uses standard. However, given that gulp-standard is officially listed as a build tool on standardjs.com, I’d be open to support these build tools explicitly.