use built in mkdir instead?

[jimmywarting]

https://github.com/jonschlinkert/write/blob/f537eb68091d0257b5a4ea915aa00a2c46727198/index.js#L183-L186

Node fs has mkdir built in with recursive mode available as a promise method https://nodejs.org/api/fs.html#fs_fspromises_mkdir_path_options