Added eu-central-1, ap-south-1, ap-southeast-2 as Amazon SES regions

lib/Mailer/Methods/AmazonSES.php

@@ -28,6 +28,9 @@ class AmazonSES {
     'US East (N. Virginia)' => 'us-east-1',
     'US West (Oregon)' => 'us-west-2',
     'EU (Ireland)' => 'eu-west-1',
+    'EU (Frankfurt)' => 'eu-central-1',
+    'Asia Pacific (Mumbai)' => 'ap-south-1',
+    'Asia Pacific (Sydney)' => 'ap-southeast-2',
   ];
 
   /** @var AmazonSESMapper */