updated address mandatory

Author: ivanwilliammd

Diff for: src/FHIR/Patient.php

@@ -241,9 +241,9 @@ public function json()
         }
 
         // Address is required
-        // if (!array_key_exists('address', $this->patient)) {
-        //     throw new FHIRException('Please use patient->setAddress($address_detail) to pass the data');
-        // }
+        if (!array_key_exists('address', $this->patient)) {
+            throw new FHIRException('Please use patient->setAddress($address_detail) to pass the data');
+        }
 
         // Telecom is required
         if (! array_key_exists('telecom', $this->patient)) {