Fix the arguments in tutorial/README


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@758525 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/tutorial/README b/tutorial/README
index 5e6f091..3d469a4 100644
--- a/tutorial/README
+++ b/tutorial/README
@@ -17,7 +17,7 @@
 3) Compile the code for the language of your choice:
 
      $ thrift
-     $ thrift --gen cpp tutorial.thrift
+     $ thrift -r --gen cpp tutorial.thrift
 
 4) Take a look at the generated code.