fix fixture for address reference

src/Bundle/ChillMainBundle/Entity/AddressReference.php

@@ -103,18 +103,30 @@ class AddressReference
         return $this;
     }
 
-    public function getPostcode(): ?string
-    {
-        return $this->postcode;
-    }
-
-    public function setPostcode(?string $postcode): self
+    /**
+     * Set postcode
+     *
+     * @param PostalCode $postcode
+     *
+     * @return Address
+     */
+    public function setPostcode(PostalCode $postcode = null)
     {
         $this->postcode = $postcode;
 
         return $this;
     }
 
+    /**
+     * Get postcode
+     *
+     * @return PostalCode
+     */
+    public function getPostcode()
+    {
+        return $this->postcode;
+    }
+
     public function getMunicipalityCode(): ?string
     {
         return $this->municipalityCode;