Set version to 5.19.beta1

CRM/Upgrade/Incremental/sql/5.19.beta1.mysql.tpl

+{* file to handle db changes in 5.19.beta1 during upgrade *}

sql/civicrm_generated.mysql

@@ -399,7 +399,7 @@ UNLOCK TABLES;
 LOCK TABLES `civicrm_domain` WRITE;
 /*!40000 ALTER TABLE `civicrm_domain` DISABLE KEYS */;
-INSERT INTO `civicrm_domain` (`id`, `name`, `description`, `config_backend`, `version`, `contact_id`, `locales`, `locale_custom_strings`) VALUES (1,'Default Domain Name',NULL,NULL,'5.19.alpha1',1,NULL,'a:1:{s:5:\"en_US\";a:0:{}}');
+INSERT INTO `civicrm_domain` (`id`, `name`, `description`, `config_backend`, `version`, `contact_id`, `locales`, `locale_custom_strings`) VALUES (1,'Default Domain Name',NULL,NULL,'5.19.beta1',1,NULL,'a:1:{s:5:\"en_US\";a:0:{}}');
 /*!40000 ALTER TABLE `civicrm_domain` ENABLE KEYS */;
 UNLOCK TABLES;

xml/version.xml

 <?xml version="1.0" encoding="iso-8859-1" ?>
 <version>
-  <version_no>5.19.alpha1</version_no>
+  <version_no>5.19.beta1</version_no>
 </version>