Update javascript-thumb.md

Author: v-jaswel

articles/cognitive-services/Computer-vision/QuickStarts/javascript-thumb.md

@@ -51,7 +51,7 @@ To create and run the sample, do the following steps:
         var subscriptionKey = document.getElementById("subscriptionKey").value;
         var endpoint = document.getElementById("endpointUrl").value;
         
-        var uriBase = endpoint + "vision/v2.1/generateThumbnail";
+        var uriBase = endpoint + "vision/v3.0/generateThumbnail";
 
         // Request parameters.
         var params = "?width=100&height=150&smartCropping=true";