fix(tests): use npm run-script update-webdriver instead of npm run update-webdriver

Author: Awk34

Diff for: Gruntfile.js

@@ -292,8 +292,8 @@ module.exports = function (grunt) {
       child_process.exec('bower install', {cwd: '../fixtures'}, function (error, stdout, stderr) {
 
         if(!process.env.SAUCE_USERNAME) {
-          grunt.log.ok('running npm run update-webdriver');
-          child_process.exec('npm run update-webdriver', function() {
+          grunt.log.ok('running npm run-script update-webdriver');
+          child_process.exec('npm run-script update-webdriver', function() {
             shell.cd('../../');
             done();
           });