Remove readOnly from lastUpdated property definition.

cassierecher · cassierecher · commit c11c9f87c2a8 · 2015-12-08T11:13:52.000-08:00
diff --git a/google-codelab.html b/google-codelab.html
@@ -242,8 +242,7 @@ <h2>Would you like to resume where you left off?</h2>
          */
         lastUpdated: {
           type: String,
-          value: '',
-          readOnly: true
+          value: ''
         },
 
         /**
