Update README for 3.x version

Author: pjcdawkins

README.md

@@ -2,19 +2,17 @@
 
 This is a PHP library for accessing the Platform.sh API.
 
-We recommend you use the [Platform.sh CLI](https://github.com/platformsh/platformsh-cli) (which uses this library) for most purposes.
-
-[![Build Status](https://travis-ci.org/platformsh/platformsh-client-php.svg?branch=master)](https://travis-ci.org/platformsh/platformsh-client-php)
+We recommend you use the [Platform.sh CLI](https://github.com/platformsh/cli) (which uses this library) for most purposes.
 
 ### Versions
 
+- The `3.x` branch (major version 3) requires PHP 8.2 and above.
 - The `2.x` branch (major version 2) requires PHP 7.2.5 and above.
+  This branch is no longer maintained.
 - The `1.x` branch (any version < 2) supports PHP 5.5.9 and above, and uses Guzzle 5.
   Old PHP versions are supported by the [Platform.sh CLI](https://github.com/platformsh/platformsh-cli), which
   is why this branch is still maintained.
 
-[![Build Status](https://travis-ci.org/platformsh/platformsh-client-php.svg?branch=1.x)](https://travis-ci.org/platformsh/platformsh-client-php)
-
 ## Install
 
 ```sh