Fix freegeoip property because of an API change

FreeGeoIp updated API to 3.0 (cf. fiorix/freegeoip@0e7907b) and changed how to handle zip code field. The field is zip_code now.

Fix #368

src/Geocoder/Provider/FreeGeoIpProvider.php

@@ -86,7 +86,7 @@ protected function executeQuery($query)
             'latitude'    => isset($data['latitude']) ? $data['latitude'] : null,
             'longitude'   => isset($data['longitude']) ? $data['longitude'] : null,
             'city'        => isset($data['city']) ? $data['city'] : null,
-            'zipcode'     => isset($data['zipcode']) ? $data['zipcode'] : null,
+            'zipcode'     => isset($data['zip_code']) ? $data['zip_code'] : null,
             'region'      => isset($data['region_name']) ? $data['region_name'] : null,
             'regionCode'  => isset($data['region_code']) ? $data['region_code'] : null,
             'country'     => isset($data['country_name']) ? $data['country_name'] : null,

tests/.cached_responses/6fd35c260d7fda4e7f347938b874844db7e65375

@@ -1 +1,2 @@
-s:223:"{"ip":"74.200.247.59","country_code":"US","country_name":"United States","region_code":"TX","region_name":"Texas","city":"Plano","zipcode":"75093","latitude":33.0347,"longitude":-96.8134,"metro_code":"623","areacode":"972"}";
+s:234:"{"ip":"74.200.247.59","country_code":"US","country_name":"United States","region_code":"TX","region_name":"Texas","city":"Plano","zip_code":"75093","time_zone":"America/Chicago","latitude":33.035,"longitude":-96.814,"metro_code":623}
+";

tests/.cached_responses/d4e19dd13e2a5ed145696eb7db068bca3da7632a

@@ -1 +1,2 @@
-s:223:"{"ip":"74.200.247.59","country_code":"US","country_name":"United States","region_code":"TX","region_name":"Texas","city":"Plano","zipcode":"75093","latitude":33.0347,"longitude":-96.8134,"metro_code":"623","areacode":"972"}";
+s:234:"{"ip":"74.200.247.59","country_code":"US","country_name":"United States","region_code":"TX","region_name":"Texas","city":"Plano","zip_code":"75093","time_zone":"America/Chicago","latitude":33.035,"longitude":-96.814,"metro_code":623}
+";