Migrate to validator 3.1.0

Validator v3+ got rid of chaining and just uses
the base validator object.  Migrate the tests to use
the validator v3 syntax.

Validator v3 has removed the regex checks,
including `is` and `not`.  Those are now
removed from anchor too, and there's no tests
that use these validations.
Merge pull request #34 from Innovation-Toolkit/master

Migrate to validator 3.1.0