code: function installDeps (deps, cliOpts, argv, cb) {
    const mods = deps.map(function (dep) {
      return function (done) {
        process.stdout.write('pkg: ' + dep + '\n')
        const infinity = '--cache-min Infinity'
        const args = [ 'npm i', cliOpts, dep, infinity ].join(' ')
        exec(args, function (err) {
          if (err) return cb(err)
        })
      }
    })
  
    parallel(mods, cb)
  }
docs: install npm dependencies (obj, str, obj, fn) -> null