Add missing call to set email during ExternalCustomer creation

composer.json

 {
   "name": "adi-ia/cbs-techstore-client-php",
   "description": "A PHP client used to connect with the CBS API and perform requests",
-  "version": "6.2.0",
+  "version": "6.2.1",
   "license": "Apache-2.0",
   "homepage": "https://wiki.doit.wisc.edu/confluence/display/ADIIA/CBS",
   "authors": [

src/main/edu/wisc/services/cbs/external_customer/ExternalCustomerInputParametersMapper.php

@@ -31,6 +31,7 @@ class ExternalCustomerInputParametersMapper
             ->setP_CUSTOMER_IDENTIFIER($customer->getCustomerIdentifier())
             ->setP_FIRST_NAME($customer->getFirstName())
             ->setP_LAST_NAME($customer->getLastName())
+            ->setP_EMAIL($customer->getEmail())
             ->setP_PHONE($customer->getPhone())
             ->setP_REFERENCE($customer->getReference())
             ->setP_TEST_MODE($customer->getTestMode());