fix taiko test for WordPress

test/taiko/apps.js

@@ -130,6 +130,8 @@ const assert = require('assert');
 
       console.log('• Wordpress')
       await goto(wordpressUrl)
+      await waitFor('Hello world!')
+      await goto(wordpressUrl + '/wp-admin/')
       await click('Log in')
       await write(wordpressUsername, into(textBox('Username')))
       await write(wordpressPassword, into(textBox('Password')))