Feature request: add support for Vue single-file components

[unikitty37]

A Vue project can have single-file components with the .vue extension, and these can contain <style> sections. Would it be possible for the plugin to parse the <style lang="scss"> sections of .vue files?

Currently, I can use sourceboat/sass-lint-vue to do this from the command line — but it's much more convenient to have the violations highlighted right there in the editor 😀