Introduce a failing test for dotless domain

[eborden]

Source Issue

https://github.com/Porges/email-validate-hs/issues/52

Issue

ICANN has prohibited dotless domain names:

https://www.icann.org/news/announcement-2013-08-30-en

While these are technically possible in the spec, they have effectively been made invalid. email-validate will accept these domains in its current form, when it should mark them as invalid.

Description

This PR introduces a failing test.

[ysangkok]

That ICANN announcement only applies to new domain names. The existing dotless names continue to be valid. Like http://ai./