Fix unit test failure.

core/src/test/java/com/taobao/arthas/core/view/ObjectViewTest.java

@@ -240,7 +240,7 @@ public class ObjectViewTest {
                 "    c1=@NestedClass[\n" +
                 "        code=@Integer[1],\n" +
                 "        c1=...\n" +
-                "... Object size exceeds size limit:100";
+                "... Object size exceeds size limit: 100, try to specify -M size_limit in your command, check the help command for more.";
         Assert.assertEquals(expected, objectView.draw());
     }