Add region workaround for node.js example

Client-compatibility-list.md

@@ -33,6 +33,8 @@ var s3 = new AWS.S3({
 });
 ```
 
+Also specify `jclouds.regions = us-east-1` to work around aws/aws-sdk-js#919.
+
 ### [boto](https://github.com/boto/boto)
 
 ```python