update read example to use ready event

Author: apucacao

README.md

@@ -17,21 +17,23 @@ Quick setup
 
 2. Create a new LDClient with your API key:
 
-        ld_client = LaunchDarkly.init("YOUR API KEY")
+        var ld_client = LaunchDarkly.init("YOUR API KEY")
 
 Your first feature flag
 -----------------------
 
 1. Create a new feature flag on your [dashboard](https://app.launchdarkly.com)
 2. In your application code, use the feature's key to check whether the flag is on for each user:
-
-        ld_client.toggle("your.flag.key", {"key" : "[email protected]"}, false, function(err, show_feature) {
-          if (show_feature) {
-              # application code to show the feature
-          }
-          else {
-              # the code to run if the feature is off 
-          }
+        
+        ld_client.once('ready', function() {
+          ld_client.toggle("your.flag.key", {"key" : "[email protected]"}, false, function(err, show_feature) {
+            if (show_feature) {
+                # application code to show the feature
+            }
+            else {
+                # the code to run if the feature is off 
+            }
+          });
         });
 
 
@@ -68,4 +70,3 @@ About LaunchDarkly
     * [docs.launchdarkly.com] (http://docs.launchdarkly.com/  "LaunchDarkly Documentation") for our documentation and SDKs
     * [apidocs.launchdarkly.com] (http://apidocs.launchdarkly.com/  "LaunchDarkly API Documentation") for our API documentation
     * [blog.launchdarkly.com] (http://blog.launchdarkly.com/  "LaunchDarkly Blog Documentation") for the latest product updates
-