refactor: use request instead of exec curl

lib/version.js

@@ -1,16 +1,16 @@
 'use strict'
 
-var exec = require('child_process').exec
+var request = require('request')
 
 var efh = require('./error').efh
 
 module.exports = function (pkg, cb) {
   if (!pkg.name) return cb(new Error('Package must have a name'))
 
-  exec('curl -s "' + process.env.npm_config_registry + pkg.name + '"', efh(cb)(function(stdout) {
-    var pkg = JSON.parse(stdout)
+  request(process.env.npm_config_registry + pkg.name, efh(cb)(function (response, body) {
+    var pkg = JSON.parse(body)
 
-    if (pkg.error) return cb(null, null, true)
+    if (response.statusCode === 404 || pkg.error) return cb(null, null, true)
 
     cb(null, pkg['dist-tags'].latest)
   }))