readme.md update

Author: david-schrenker

README.md

@@ -191,6 +191,7 @@ For more information about AMP please see [AMP Project](https://amp.dev/document
 
 <a name="version"></a>
 # Version
+* 1.2.1 - Adding optional retry logic for Http requests. If configured, the request will retry when certain 500 errors occur (500, 502, 503, 504)
 * 1.1.1 - Adding request timeout value on the client for Http requests
 * 1.1.0 - Adds Amp Html Support
 * 1.0.0 - Initial Release