Improve Readme doc

@@ -23,15 +23,16 @@ Monitor can be configured by passing options object into `expressMonitor` constr
 
 Default config:
 ```
+title: 'Express Status',  // Default title
 path: '/status',
 spans: [{
-  interval: 1,     // Every second
-  retention: 60    // Keep 60 datapoints in memory
+  interval: 1,            // Every second
+  retention: 60           // Keep 60 datapoints in memory
 }, {
-  interval: 5,     // Every 5 seconds
+  interval: 5,            // Every 5 seconds
   retention: 60
 }, {
-  interval: 15,    // Every 15 seconds
+  interval: 15,           // Every 15 seconds
   retention: 60
 }]