Update README.md

README.md

@@ -370,7 +370,7 @@ is a simple demonstration of how to get live updates for Instrument Profiles
   extends `DXFeedSubscription` to conveniently subscribe to time series events for a set of symbols and event types
   ([Java API sample](https://github.com/devexperts/QD/blob/master/dxfeed-samples/src/main/java/com/dxfeed/sample/api/DXFeedConnect.java))
 
-- [ ] [ObservableSubscription](https://github.com/devexperts/QD/blob/master/dxfeed-api/src/main/java/com/dxfeed/api/osub/ObservableSubscription.java) is an observable set of subscription symbols for the specific event type ([Java API sample](https://github.com/devexperts/QD/blob/master/dxfeed-samples/src/main/java/com/dxfeed/sample/_simple_/PublishProfiles.java))
+- [x] [ObservableSubscription](https://github.com/devexperts/QD/blob/master/dxfeed-api/src/main/java/com/dxfeed/api/osub/ObservableSubscription.java) is an observable set of subscription symbols for the specific event type ([Java API sample](https://github.com/devexperts/QD/blob/master/dxfeed-samples/src/main/java/com/dxfeed/sample/_simple_/PublishProfiles.java))
 
 - [ ] [GetLastEvent](https://docs.dxfeed.com/dxfeed/api/com/dxfeed/api/DXFeed.html#getLastEvent-E-)
   returns the last event for the specified event instance