Update README.md

Author: sylvainraye

README.md

@@ -9,14 +9,14 @@ Matrix compatibility:
 | Sylius version(s)  | API PHP Client version  |CI status                                                                                                                 |
 |--------------------|-------------------------|--------------------------------------------------------------------------------------------------------------------------|
 | v1.6               | v1.0                    ||
+| v1.7               | v1.0                    ||
 | -                  | master                  ||
 
 Note that our PHP client is backward compatible.
-For example, if your PIM is currently a v2.3, you can still use a 1.0 version of the PHP client. The new endpoints available in v2.3 will not be available in the v1.0 of the PHP client.
 
 ## Requirements
 
-* PHP >= 5.6
+* PHP >= 7.3
 * Composer