Set unsubscribed true

... should probably set it to true when unsubscribed :-$

Author: benjchristensen

rxjava-core/src/main/java/rx/subscriptions/BooleanSubscription.java

@@ -20,7 +20,7 @@ public boolean isUnsubscribed() {
 
     @Override
     public void unsubscribe() {
-        unsubscribed.set(false);
+        unsubscribed.set(true);
     }
 
 }