added note about how to revert to old behavior for robotstxt

docs/news.rst

@@ -32,7 +32,8 @@ This 1.1 release brings a lot of interesting features and bug fixes:
     If you try ``scrapy shell index.html`` it will try to load the URL http://index.html,
     use ``scrapy shell ./index.html`` to load a local file.
   - Robots.txt compliance is now enabled by default for newly-created projects
-    (:issue:`1724`).
+    (:issue:`1724`). If you need old behavior, update :setting:`ROBOTSTXT_OBEY`
+    in ``settings.py`` file when creating a new project.
   - Exporters now work on unicode, instead of bytes by default (:issue:`1080`).
     If you use ``PythonItemExporter``, you may want to update your code to
     disable binary mode which is now deprecated.