Updated README.md

Author: Ang3

README.md

@@ -16,11 +16,6 @@ If you are in Symfony application, I suggest you to install the bundle
 [ang3/odoo-api-bundle](https://github.com/Ang3/odoo-api-bundle). 
 It provides a registry you can configure easily and deploys clients as services.
 
-**Documentation for v5.0 (master)**
-
-For older versions, please see the last stable 
-[documentation](https://github.com/Ang3/php-odoo-api-client/tree/v4.0.0).
-
 Requirements
 ============