make linter happy

Author: yyx990803

lib/check-version.js

@@ -7,7 +7,7 @@ module.exports = function (done) {
     url: 'http://registry.npmjs.org/vue-cli',
     timeout: 1000
   }, function (err, res, body) {
-    if (!err && res.statusCode == 200) {
+    if (!err && res.statusCode === 200) {
       var latestVersion = JSON.parse(body)['dist-tags'].latest
       var localVersion = require('../package.json').version
       if (semver.lt(localVersion, latestVersion)) {