Remove fake credentials from readme

This is causing some people's cred scanner to go off, we should just remove it since its just an example and doesn't serve too much purpose

Author: Danny McCormick

README.md

@@ -33,7 +33,7 @@ import * as azdev from "azure-devops-node-api";
 // your collection url
 let orgUrl = "https://dev.azure.com/yourorgname";
 
-let token: string = process.env.AZURE_PERSONAL_ACCESS_TOKEN; // e.g "cbdeb34vzyuk5l4gxc4qfczn3lko3avfkfqyb47etahq6axpcqha"; 
+let token: string = process.env.AZURE_PERSONAL_ACCESS_TOKEN;
 
 let authHandler = azdev.getPersonalAccessTokenHandler(token); 
 let connection = new azdev.WebApi(orgUrl, authHandler);