Added test_get_user_medias
Added test_get_user_medias

Added `test_get_user_medias` with and without `filtration`.

no need to test `is_comment=True` because there's no item 'comments' in user feed object returned by `feed/user/{user_id}/` API call.
ohld/instabot,instagrambot/instabot,instagrambot/instabot