minor correction in the readme file example

miguelgrinberg · miguelgrinberg · commit 6abd86fd868a · 2016-08-18T09:50:36.000-07:00
diff --git a/README.rst b/README.rst
@@ -47,6 +47,7 @@ client:
 
     import socketio
     import eventlet
+    import eventlet.wsgi
     from flask import Flask, render_template
 
     sio = socketio.Server()
