make zip field of account string for european countries (#78)

Author: daniel-exceed

src/main/java/com/darksci/pardot/api/response/account/Account.java

@@ -39,7 +39,7 @@ public class Account {
     private String city;
     private String state;
     private String territory;
-    private Integer zip;
+    private String zip;
     private String country;
     private String phone;
     private String fax;
@@ -96,7 +96,7 @@ public String getTerritory() {
         return territory;
     }
 
-    public Integer getZip() {
+    public String getZip() {
         return zip;
     }
 

src/test/java/com/darksci/pardot/api/parser/account/AccountReadResponseParserTest.java

@@ -53,7 +53,7 @@ public void testRead() throws IOException {
         assertEquals("Has correct city", "Atlanta", account.getCity());
         assertEquals("Has correct state", "GA", account.getState());
         assertEquals("Has correct territory", "Test Territory", account.getTerritory());
-        assertEquals("Has correct zipcode", 30064, (int) account.getZip());
+        assertEquals("Has correct zipcode", "30064", account.getZip());
         assertEquals("Has correct country", "United States", account.getCountry());
         assertEquals("Has correct phone", "123-456-4789", account.getPhone());
         assertEquals("Has correct createdAt", "2016-01-04T10:39:26.000Z", account.getCreatedAt().toString());