Update the eTLD database to 2019-04-19T09:28:27Z.

[keiko713]

I ran:

bundle exec rake etld_data
bundle exec rake test
bundle exec rake etld_data:commit

Actually maybe we shouldn't ship this yet, but just as a preparation when it comes.
Also there are several good PRs in upstream that we may wan to consider importing: knu#19

Also this gem is actually more popular, which we could potentially consider switching: https://github.com/weppos/publicsuffix-ruby