1.4.0

• Used strict_types and namespaces.

• Created exception InvalidVerifyException.php in case verify is used with some invalid data.

• Added docs for all verifiers.

• Added data validations with php issers functions and instanceof.

• BC: equalXMLStructure and its corresponding test were removed.

• BC: hasntKey verifier renamed to hasNotKey for clarity.

• BC: Removed support for PHP 7.0 and its corresponding versions of PHPUnit and phpunit-wrapper.