Missing mkdirp dependency

[rchl]

The mkdirp dependency is not listed in dependencies.

npx vue-docgen-web-types
internal/modules/cjs/loader.js:883
  throw err;
  ^

Error: Cannot find module 'mkdirp'
Require stack:
- /Users/project/node_modules/vue-docgen-web-types/lib/build.js
- /Users/project/node_modules/vue-docgen-web-types/lib/cli.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15)
    at Function.Module._load (internal/modules/cjs/loader.js:725:27)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (internal/modules/cjs/helpers.js:88:18)
    at Object.<anonymous> (/Users/project/node_modules/vue-docgen-web-types/lib/build.js:39:34)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Module.require (internal/modules/cjs/loader.js:952:19) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    '/Users/project/node_modules/vue-docgen-web-types/lib/build.js',
    '/Users/project/node_modules/vue-docgen-web-types/lib/cli.js'
  ]
}