Use https for wsdl url (#34)

It seams like the url is not reachable via http any more.

src/Vies/Client.php

@@ -15,7 +15,7 @@ class Client
  *
  * @var string
  */
- private $wsdl = 'http://ec.europa.eu/taxation_customs/vies/checkVatService.wsdl';
+ private $wsdl = 'https://ec.europa.eu/taxation_customs/vies/checkVatService.wsdl';
 
  /**
  * SOAP client
@@ -29,9 +29,9 @@ class Client
  *
  * @var array
  */
- private $classmap = array(
+ private $classmap = [
  'checkVatResponse' => 'Ddeboer\Vatin\Vies\Response\CheckVatResponse'
- );
+ ];
 
  /**
  * Constructor
@@ -58,10 +58,10 @@ public function checkVat($countryCode, $vatNumber)
  {
  try {
  return $this->getSoapClient()->checkVat(
- array(
+ [
  'countryCode' => $countryCode,
  'vatNumber' => $vatNumber
- )
+ ]
  );
  } catch (SoapFault $e) {
  throw new ViesException('Error communicating with VIES service', 0, $e);
@@ -78,11 +78,11 @@ private function getSoapClient()
  if (null === $this->soapClient) {
  $this->soapClient = new \SoapClient(
  $this->wsdl,
- array(
+ [
  'classmap' => $this->classmap,
  'user_agent' => 'Mozilla', // the request fails unless a (dummy) user agent is specified
  'exceptions' => true,
- )
+ ]
  );
  }