Set default AWS region of us-east-1

S3 and CloudFront are both global, so this should
work perfectly fine as a default.

Author: john-shaffer

src/S3/S3Options.php

@@ -47,7 +47,7 @@ public static function optionSpecs(): array {
             new OptionSpec(
                 'string',
                 self::getName( 'awsRegion' ),
-                '',
+                'us-east-1',
                 'AWS Region',
                 'Region'
             ),