updated test_edit_profile_change_display_name per issue 60. 

updated test to use default account. updated test to verify saved default username + timestamp.
(issue 60)
Thanks. Based on this excerpt from the linked page:

"Imports should be grouped in the following order:

1 standard library imports
2 related third party imports
3 local application/library specific imports"

..., is this the expected order and separation?

import pytest
from datetime import datetime

from unittestzero import Assert

from pages.start_page import StartPage