Add sydney region as a region choice to preconfigure script

Author: echo-bravo-yahoo

scripts/pre-configure.js

@@ -20,7 +20,7 @@ iam.getUser({}, (err, data) => {
       name: 'primaryAwsRegion',
       message: 'Region:',
       type: 'list',
-      choices: ['us-east-1', 'us-west-2', 'eu-west-1', 'eu-central-1', 'ap-northeast-1', 'ap-northeast-2'],
+      choices: ['us-east-1', 'us-west-2', 'eu-west-1', 'eu-central-1', 'ap-northeast-1', 'ap-northeast-2', 'ap-southeast-2'],
       default: 'us-east-1'
   }, {
       name: 'artifactsS3BucketName',