Remove Deprecated Usage in Contrib Modules

Author: benjchristensen

src/test/java/rx/debug/DebugHookTest.java

@@ -95,7 +95,7 @@ public void testSimple() {
         final DebugHook hook = new DebugHook(listener);
         RxJavaPlugins.getInstance().registerObservableExecutionHook(hook);
 
-        Observable.from(1).subscribe(Subscribers.empty());
+        Observable.just(1).subscribe(Subscribers.empty());
 
         final InOrder inOrder = inOrder(listener);
         inOrder.verify(listener).start(subscribe());