Updated README

Author: BernardHarrison

README.md

@@ -213,6 +213,7 @@ This example demonstrates how to send a bulk message with an AMP Html body.
 For more information about AMP please see [AMP Project](https://amp.dev/documentation/)
 
 <a name="version"></a>
+* 1.4.3 - Added MetadataOrTagsAreTooLarge error messsage
 * 1.4.0 - Adding Metadata and Tags
 * 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