Allow string paths to configuration in package.json

[flugg]

This will allow users to specify a configuration path in package.json, instead of having to add a new configuration file when using shared config files. Follows the same pattern as Prettier:

  "prettier": "@my-company/prettier-config",
  "simple-git-hooks": "@my-company/simple-git-hooks-config",

[toplenboren]

Hi, thanks for PR. Gonna release it now :) sorry for the delay