Change Nexmo to Vonage

Author: tbedford

README.md

@@ -1,8 +1,8 @@
-# Nexmo cURL Examples
+# Vonage cURL Examples
 
 <img src="https://developer.nexmo.com/assets/images/Vonage_Nexmo.svg" height="48px" alt="Nexmo is now known as Vonage" />
 
-This repository is a collection of things you can do with [Nexmo's](https://nexmo.com) APIs, all shown with cURL.
+This repository is a collection of things you can do with [Vonage APIs](https://developer.nexmo.com), all shown with cURL.
 
 ## Pre-requisites