update

Author: mevdschee

README.md

@@ -3,10 +3,14 @@
 Single file PHP that can serve as a JWT based authentication provider 
 to the [PHP-CRUD-API](https://github.com/mevdschee/php-crud-api) project.
 
+**NB: Stable "v1" branch is:**
+https://github.com/mevdschee/php-api-auth/tree/v1
+
 ## Requirements
 
   - PHP 7 or higher
 
 ## Installation
 
-...
+...
+