Merge pull request #1891 from murgatroid99/grpc-js-xds_feature_list_update

grpc-js-xds: Update readme feature list

Author: murgatroid99

packages/grpc-js-xds/README.md

@@ -22,4 +22,8 @@ const client = new MyServiceClient('xds:///example.com:123');
 ## Supported Features
 
  - [xDS-Based Global Load Balancing](https://github.com/grpc/proposal/blob/master/A27-xds-global-load-balancing.md)
- - [xDS traffic splitting and routing](https://github.com/grpc/proposal/blob/master/A28-xds-traffic-splitting-and-routing.md)
+ - [xDS traffic splitting and routing](https://github.com/grpc/proposal/blob/master/A28-xds-traffic-splitting-and-routing.md)
+ - [xDS v3 API](https://github.com/grpc/proposal/blob/master/A30-xds-v3.md)
+ - [xDS Timeouts](https://github.com/grpc/proposal/blob/master/A31-xds-timeout-support-and-config-selector.md)
+ - [xDS Circuit Breaking](https://github.com/grpc/proposal/blob/master/A32-xds-circuit-breaking.md)
+ - [xDS Client-Side Fault Injection](https://github.com/grpc/proposal/blob/master/A33-Fault-Injection.md)