update code example

README.md

@@ -3,7 +3,7 @@
 [![Travis-CI](https://img.shields.io/travis/giansalex/ubl-validator.svg?branch=master&style=flat-square)](https://travis-ci.org/giansalex/ubl-validator)
 [![Coverage Status](https://img.shields.io/coveralls/giansalex/ubl-validator.svg?label=coverage&style=flat-square&branch=master)](https://coveralls.io/github/giansalex/ubl-validator?branch=master)
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-OASIS Universal Business Language Schema Validator - SUNAT.
+OASIS Universal Business Language Schema Validator, SUNAT - Perú.
 
 ## Install
 Via Composer from [packagist.org](https://packagist.org/packages/greenter/ubl-validator).
@@ -13,12 +13,16 @@ composer require greenter/ubl-validator
 
 ## Example
 ```php
+use Greenter\Ubl\Resolver\UblVersionResolver;
 use Greenter\Ubl\SchemaValidator;
 
+$xmlPath = '20000000001-01-F001-1.xml';
+$xml = file_get_contents($xmlPath);
+
 $validator = new SchemaValidator();
-$validator->setVersion('2.0');
+$resolver = new UblVersionResolver()
+$validator->setVersion($resolver->getVersion($xml));
 
-$xml = file_get_contents('20000000001-01-F001-1.xml');
 $result = $validator->validate($xml);
 
 if ($result) {