Merge pull request #77 from Nexmo/vonage-wordmark

Update branding in README

Author: Lorna Jane Mitchell

README.md

@@ -1,5 +1,7 @@
 # Nexmo APIs Quickstart Examples for Node.JS
 
+<img src="https://developer.nexmo.com/assets/images/Vonage_Nexmo.svg" height="48px" alt="Nexmo is now known as Vonage" />
+
 
 Quickstarts also available for: [Java](https://github.com/nexmo-community/nexmo-java-quickstart), [.NET](https://github.com/nexmo-community/nexmo-dotnet-quickstart), [PHP](https://github.com/nexmo-community/nexmo-php-quickstart), [Python](https://github.com/nexmo-community/nexmo-python-quickstart), [Ruby](https://github.com/nexmo-community/nexmo-ruby-quickstart)