Preparing the README for cutting master over to the 4.x series

README.md

@@ -1,15 +1,13 @@
 # ramsey/uuid
 
-_NOTICE: Formerly known as `rhumsaa/uuid`, The package and namespace names have changed to `ramsey/uuid` and `Ramsey\Uuid`, respectively._
-
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-ramsey/uuid is a PHP 7+ library for generating and working with [RFC 4122][rfc4122] version 1, 3, 4, and 5 universally unique identifiers (UUID).
+ramsey/uuid is a PHP 7.2+ library for generating and working with [RFC 4122][rfc4122] version 1, 3, 4, and 5 universally unique identifiers (UUID).
 
 This project adheres to a [Contributor Code of Conduct][conduct]. By participating in this project and its community, you are expected to uphold this code.
 
@@ -32,6 +30,11 @@ composer require ramsey/uuid
 ```
 
 
+## Upgrading from 3.x to 4.x
+
+TODO
+
+
 ## Upgrading from 2.x to 3.x
 
 While we have made significant internal changes to the library, we have made every effort to ensure a seamless upgrade path from the 2.x series of this library to 3.x.